Star-Crossed - June 15, 1972 - S1-E3
Revealing mistake: Sam stares at himself in the mirror and takes out his wallet to determine who he's leaped into. But the "reflection" in the mirror lowers the wallet and looks back up before Sam does. (00:05:20)
Revealing mistake: When the first fight starts, the Bloober disappears into thin air. (00:04:52)
The Ringer - S1-E1
Revealing mistake: When Link calls down to Zelda from the tower, you can see a fault in the drawing as Zelda moves. There is a low wall around her on the balcony, with flowers and vines on it. As she moves, you can see some of her dress pass right through the wall and vines towards the lower right. (00:01:50)
Revealing mistake: When they arrived at Montana, the Captain said that this is where we will stop and build a ranch. There are two straight depressions in the ground converging together that would not have been there since this was virgin land.