This a great movie, no doubt. Pitt and DiCaprio give outstanding performances. DiCaprio's combination of Burt Reynolds, Nick Adams, Steve McQueen and mostly Clint Eastwood is amazing. I think (although almost nobody else does) that Pitt's character is closest to Richard Harrison. I graduated from high school in 1969 and this film takes me right back to that time. Both Brad Pitt and Leonard DiCaprio deserve Oscars.
However. In order to believe the ending, you have to believe everything that comes before it and there are some glaring errors, that I am surprised made it into the film.Three that jumped out at me:
When Brad Pitt goes to his trailer near a drive-in, the movie playing has a GP rating. In 1969 the ratings were GMRX (they even had a trailer with a song Gymrix, what's Gymrix that played before the feature to explain the new rating system.) It would have been rated M for mature audiences, as was "The Wrecking Crew." M was replaced by GP in 1971 and by PG in 1972
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All freeways had ONLY white lines in 1969. There were no yellow lines. The only yellow lines were solid yellow no passing lines on two lane roads. When the interstates were built in the 50's the Feds declared that all lines would be white, to replace the mixture of white, yellow, and sometimes red. In 1972 they went to the Yellow/White combination in use today.
The weather on the radio stations playing in the Caddy is all wrong for the dates. It would have been simple to have the right temperatures.
I only saw it once, and I was blown away, but those are wristwatch on the arm in One Million Years B.C (or more recently Starbucks cup on the table in Game of Thrones) moments.