It's All Downhill From Here - S2-E16
Revealing mistake: While Ralph is invisible and eavesdropping on Klein's conversation, when Ralph picks up a pencil and taps it on the desk, we can see the stiff wire attached to the pencil moving up and down, at the left side of the screen. (00:27:35)
There's Just No Accounting... - S2-E18
Revealing mistake: After Ralph tells Bill that the kidnappers are planning to take another child, when Bigsby walks out of the Sherwin house, in the next shot just as Ralph flies off we can see the stunt's springboard between the bush and the tree. (00:31:05)
Revealing mistake: When Ralph stops the hijacked train before it reaches the city of Bakersfield, due to the close proximity of the camera it's too obvious that Ralph's footwear has been altered for the stunt, as he glides across the tracks. (00:44:30)
Revealing mistake: When Ralph blocks Hydra's rocket from its target, in the closeup as the rocket hits Ralph's abdomen the thin stunt wire is visible at the rocket tail. Then while Bill is fighting with Hydra, when Ralph is in mid-air heading to Bill the stunt apparatus is visible at Ralph's waist. (00:40:00)
Don't Mess Around With Jim - S2-E3
Revealing mistake: While they're on Beck's jet Ralph uses the suit's telekinetic powers on the ice-filled cup, and Ralph tells Bill he'll do it again with a magazine, then when it cuts to the first closeup of the magazines the stunt wire attached to the book is visible. (00:15:45)
The Two-Hundred-Mile-an-Hour Fastball - S2-E1
Revealing mistake: During Ralph's tryout for the team, when the catcher yells, "Come on, skinny bones, try to put one right there...," the stunt wire is visible behind the catcher in this shot as well as the following shot, when he flips over. (00:10:10)
Revealing mistake: At the paramilitary base, after Bill tells Bunker he has "a real cute bivouac goin'," it cuts to a shot of Ralph searching for Bill's location, and the stunt apparatus is visible at Ralph's waist area. (00:21:30)
The Shock Will Kill You - S2-E13
Revealing mistake: While Ralph, Pam, and Bill are at the motel, Ralph wraps up all the metal plate covers and cutlery inside the bedspread, then when Ralph walks back and forth we can see the wires attached to the bedspread bundle as it moves. (00:18:15)
Revealing mistake: When Bill is pushed out of the helicopter and Ralph rescues him in mid-air, its obvious in some shots that it is two sky-divers dressed as Ralph and Bill. Firstly you can see the parachute back-pack bulges on both men. Also the wind is blowing up on Ralph even though he isn't meant to be descending.