Audrey's curl appears and disappears under her blindfold during the audition.
When Steve is doing a card trick for Oscar, a visible wire moves the cards.
Steve was trying to move around the villain's house unnoticed, so he wouldn't have noisily kicked down the door of his holding-room to escape when he could have quietly broken the locked doorknob by forcibly twisting it with his bionic hand and arm.
When Steve is showing of his card tricks at the beginning, he does so in front of the magician Dave Powell. Given that Steve's power are Top Secret, this doesn't make sense, especially when Oscar openly talks about Steve's bionics.