Young Frankenstein

Revealing mistake: When Helga is sent flying into her room, the support cable that is attached to her is visible.

Revealing mistake: In the classroom Frederick stabs himself in the leg with a scalpel. Look closely and you can see the thick pad covering his thigh inside his trouser leg. (00:11:10)

Revealing mistake: One of Peter Boyle's teeth on his lower jaw was painted black for that "broken grin" look. It can be seen reflecting in some scenes: when Frankenstein enters the cell with the monster and it cries, and later when the monster screams while killing the jailer. (01:15:30 - 01:28:40)

Phoenix

Revealing mistake: For most of the opera house stage presentation, the monster is a full head taller than Friedrich. During the tap dance, however, they're the same height. Although the camera angle/depth of field used tries to disguise this by keeping Gene Wilder in the foreground for most of the shots, it's still apparent that Peter Boyle isn't wearing his probably-impossible-to-dance-in platform shoes during the sequence. (01:24:00)

Jean G

Continuity mistake: In the scene where Inga, Fredrick and Igor throw the net over the monster, Inga sticks the syringe of the sedative in the monster's back but does not push down on the top, yet the monster still falls over. A few seconds later when she collapses on the monster, you can see all of the fluid inside spray out. (01:12:05)

More mistakes in Young Frankenstein

Inga: Dr. Fronkensteen! Are you all right?
Fredrick Frankenstein: MY NAME...IS FRANKENSTEIN!

More quotes from Young Frankenstein

Trivia: The Laboratory equipment is the same equipment used in the original Frankenstein.

More trivia for Young Frankenstein

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