The Grim Reaper Wears a Teflon Coat - S1-E5
Revealing mistake: When Whirlwind shows up on Mandarin's monitor to tell him Iron Man is attacking, Whirlwind appears out of thin air. (00:14:22)
Life Lessons - S1-E4
Revealing mistake: When Danziger and True are pursuing Gaal, they drive up next to Gaal and his horse. In several shots it's obvious it isn't Danziger driving, but a stunt double. (00:47:10)