I saw a special on the making of the movie. It said that 98% of the movie was accurate and thet athe Steve McQueen movie scene was put in for one reason.
Steve was the hottest actor at the time and he loved motorcycles- that is how they got him to be in movie by writng that scene in for him
It was a Limey bike. WTF do they want ?
But then they had a stunt man to do the actual jump - the deceptive web becomes ever yet more tangled...
He also jumped on the bike and did his own stunts after seeing the stunt driver do it, and not think it was very good.
Director blew his lid.
(Or so I’ve heard.)