Ah, that would explain the movies I've seen where the widescreen version had more picture information on the sides but the full-frame version had more information at the top and bottom.

I remember all the problems with the Titanic film print from working at a theater that had it when I worked there. For some reason, they used a really cheap film stock that wasn't intended for the longer movies. As the movie got closer to the end the film would start to buckle in on itself and eventually get tangled in the "brain" unit on the projector until the film broke and the movie got interrupted. We had to have someone stand at the film platter and physically push the film back into place as it unwound for the last 45-60 minutes of the movie. It was such a pain.

We had the film tangle and break about halfway through the credits once and all these old ladies came out complaining that they didn't get to hear the end of that Celine Dion song and demanding a refund.