Factual error: In the beginning of the episode "Show and Tell", you can see Woody clipping his toenails on the bed. You can see how many toes he has one of his feet. He has 5 toes. Yet, in one of the first episodes, Woody states he has 8 toes on one foot and 3 on the other.
Triumvirate of Terror! - S3-E8
Factual error: During the final fight in Lex's lair, Joker gives Batman a good smack with his large hammer. As is common in this show, when a good hit is delivered, a freeze frame is show with the figures moving in slow motion with a stylized colorful backdrop to add to the drama dynamics. But as Joker delivers this hit and this stylized shot is shown, the show cuts to some inmates in a prison cell watching the fight on TV. The same stylized shot is shown on their TV, where it would be show like that there, only to us. They would have just seen Joker hit Batman with the hammer and him fly off in real time with no stylized back drop or slow mo. (00:20:00)
Iron Forged in Fire: Part One - S1-E1
Factual error: As Tony is being escorted to Obadiah Stane’s office six months after Howard’s death, there is a close up of Trish’s computer keyboard. Everything on the keyboard matches up how it’s supposed to be on a QWERTY layout, except rather than the 4 being between E/R or above the R, as is standard on all keyboards, it's between R/T. All the numbers are moved over from where they are supposed to be. (00:07:50)
Factual error: When the X-Men are surfacing after crashing their jet into the dam, Shadowcat is shown phasing through the jet and pulling Wolverine and Beast through with her. Since Wolverine's bones are coated with a heavy metal, he wouldn't be able to float to the surface. He would sink instead. (00:14:57)