Recently, I was cleaning up my inventory of previously unwatched DVDs, so I re-watched "Sherlock" and the pilot episode "Pink Research" that was included as a tidbit at the time.
The pilot episode "Pink Research" has never been publicly broadcast on television, so it is also known as "Sherlock" Episode 0.

Before the official copyright was introduced into the country, the pilot episode was briefly popular on the domestic network for a while, and then it was difficult to find. Therefore, for "Shenxia" fans, the pilot episode is a must-see, but there are still many ordinary viewers who are not aware of the existence of these 0 episodes.
The released version of "Pink Study" is based on the first case in Conan Doyle's Sherlock Holmes detective story, "The Study of the Blood Letter". In the play, Watson returns to London wounded from the battlefield and meets Sherlock Holmes while looking for a house, and it so happens that Lestrad of Scotland Yard encounters a problem and asks Sherlock Holmes for help.
Unlike the key clue "Blood Letter" in the original work, the key clue of this case is framed in the play "Pink". The victim was dressed in pink clothes and dragging small pink suitcases. With "Pink", the case has a key breakthrough.
The story of the pilot episode is 70% consistent with the official version, and the pilot episode presents a "roughness" that is visible to the naked eye in the effect. For example, Watson's clothing is really 100% working class, for example, most of the lighting is not there, and the post-special effects are nothing.
Most of the scenes just make a rough look. The computer room at The Barts School of Medicine is as rudimentary as the computer room at any second- or third-rate university in the country. 221 Baker Street B is not bad, it already has a basic look, but it also makes no secret of itself being the set in a theater somewhere.
Many fans said that they also like this warm color
There are also some that are too expensive to shoot without shooting. For example, the pilot episode directly starts with Watson tossing and turning in bed, and the official version has money and a scene of war, which explains the history of Watson's injured psychology overshadowed.
Moreover, as a serial murder case, the official version spends a lot of time at the beginning to describe the identity background and the process of being killed by the three victims. There was also a fairly large police press conference. The pilot episode is a few lines passed.
The difference of the remaining 30% is that, on the one hand, Benedict Cumberbatch has not portrayed Holmes in exactly the same way.
Compared with the "cold and ruthless" posture in the first season of the broadcast version, the roll fu in the pilot episode is more relaxed, or more "humane". From another point of view, the former Sherlock can be said to be mature and fully evolved, while the latter Sherlock is more like a young and lively, with a kind of juvenile detective temperament.
On the other hand, it is the difference in the direction of the plot.
In the pilot episode, Holmes lures out the real killer with the victim's pink box. In the restaurant, Holmes had deduced that the killer should be a taxi driver in London. When the driver showed up, he gave Holmes a shot and took him straight to Baker Street, where he had a final showdown.
The official version is more complicated. Holmes and Watson chased after the suspicious taxi and passengers, and after a considerable chase interception, they thought that the murderer was a passenger in the taxi, and did not think that the driver was actually the murderer.
Holmes then used the key information left by the pink victim on the ground to log into the victim's mailbox and lock the murderer's location. At this time, the murderer took the initiative to appear on Baker Street to challenge Sherlock Holmes. The place where the two ended up singled out became the school.
The pilot episode ended up on Baker Street
The most important difference is that the pilot episode is only a separate case, while the official version adds Holmes's nemesis, James Moriarty.
At the end of the official version, the taxi driver reveals that he was instigated. Pressed by Holmes, he shouted, Moriarty. In addition, the official version also has Sherlock's brother, Mycroft Holmes, more than the pilot episode. Watson is taken away by Mycroft, who is asked to provide Sherlock's information at any time.
Watson, who knew nothing about McCroft, thought this man was a big bad guy and refused to cooperate. At the end, McCroft told Watson that he had entered a battlefield. We all know that this is the eternal battlefield of good and evil, light and darkness. In fact, the purpose of this paragraph is to pave the way for Moriarty's appearance.
(In Season 2, it was McCroft who compromised with Moriarty in order to gain information, telling the latter's brother Sherlock.)
It can be said that Moriarty is a hidden trick released after the pilot episode survived until the official version.
Moriarty
Of course, the biggest significance of this pilot episode is that the BBC executives were so satisfied after watching it that they decided to invest more and asked the production team to expand from the original plan of 60 minutes per episode to the later 90 minutes per episode. That's where we see Sherlock today.
In the same situation, if you leave us here, everyone who comes over will tell you that if you don't have excellent psychological quality and profound life experience, you must not watch the draft of film and television dramas.