Other mistake: Fred's tie gets unraveled when he and Barney are trying to escape the Green Goose's dungeon. Yet, his tie is fixed a few minutes later.
The Man Called Flintstone (1966)
1 mistake
Directed by: William Hanna, Joseph Barbera
Starring: Mel Blanc, Alan Reed, Jean Vander Pyl
Barney Rubble: Well, that's what always happens to guys who want to take over the world.
Fred Flintstone: Yeah, they end up out of it.