Mister Ed

Revealing mistake: (Original theatrical release) When the imperial officer yells "Freeze", he is transparent and you can see the reactor through him.

Mister Ed

Pros and Cons - S1-E4

Revealing mistake: When Hannibal drives the blue car into the sheriff's office trying to get arrested, the wooden jump ramp is visible.

Mister Ed

Revealing mistake: When Harkin Banks almost loses control and skis through the lodge, the jump ramp is visible as the woman opens the door. (01:29:45)

Mister Ed

Show generally

Revealing mistake: Throughout numerous episodes while the team is supposed to be driving the van, the gear selector can be seen in the "park" position.

Mister Ed