Just to say i am not sure if this has been mentioned in this thread yet or not but that scene some of you are complaining about where the Mustang loops onto the 262 actually happend.
The pilot was Roscoe Brown from the flight which later earned the title The Longest Escort of The War in which the B-17s the flight was covering came under attack from 262's.
Brown developed his own version of the Split S in which instead of rolling straight down he would first climb to increase his speed in the dive in order to catch 262, at point of stalling he would either flip the plane or pitch down to start the dive.
He successfully shot down this 262.
Here is the story from Discoverys "Dogfights" told by the actual pilot. Thankfully the part of the story we need is right at the beginning of this video.
Cheers
S!
Mini