#1 the shots are synched fine, it is just your mind manufacturing evidence.

#2 Leto (?) is using one shot and 2 cameras so that #1 is a realistic reflection.

#3 the mirror doesn't exhist and is chromakey, it is also where the 2nd camera is located.

#4 Lighting is as you would expect from any tv/movie production. Artificial lighting in these productions are horribly unrealistic with tons of hidden lightsources coming from above.

Tags for this video have been changed from 'Green Screen, ChromaKey, Fake, TV, Special Effects' to 'green screen, chromakey, compositing, fake, tv, special effects' - edited by Stingray

Here's some other things to consider: first, it IS Bernie Taupin that introduces Shatner. I have never seen him anywhere else in my history. Although I haven't seen everything I think this is pretty rare.

Next, if you don't watch this video to the end you miss something special.

The following is from Wikipedia:

The song has been performed by many others (for example, Kate Bush) but arguably the most famous performance was in 1978, at a science fiction film awards ceremony, Bernie Taupin personally introduced William Shatner's unique interpretation of Rocket Man. Shatner's version utilized then-modern chromakey video techniques to portray simultaneously three different facets of the Rocket Man's character. A low-resolution video circulates on the Internet [1]. This performance has built up a cult following, and was parodied on the U.S. animated series Family Guy, Freakazoid, Futurama, Canadian CGI series ReBoot, as well as in the video for "Where It's At" by Beck.