I'm not 100% sure, but I think the 'Oberkassel Bridge' scene is fictional. There is an
ATB article covering the Rhine Bridges but I don't have time to dig my copy out just now....
FWIW,
'The Bridge At Remagen' is a favorite movie of mine ; or maybe it's just because I saw it when it came out. I've seen it argued that the shoulderboards are wrong, that the Shermans wouldn't have engaged the 88s across the river, etc etc. But as usual, one has to bear in mind that it's not a documentary, it's a Hollywood movie made to entertain and to make money.
For its time, the locations were excellent, the music score is very good, the acting surprisingly effective ( at the time, it was
very hard to accept
The Man From UNCLE as a 'Nazi'.... ), and there are some very spectacular scenes. It was also one of the earlier movies to portray the Germans as formidable opponents rather than 'stupid dummkopfs'.
And yes, the opening scene is very effective ( for some reason, I love the way it segues into the shot of the speeding Jeep ). Rather as with
'Where Eagles Dare', I watch the opening and settle into my seat, thinking 'Ah - this is going to be
good' 
)