Card-Trick-Corner
After flip the card, take few seconds to concentrate (Pretend that you concentrate to read the card) then name any card just before you show the deck of card to the audience.
Very likely you will be failed to name the card that your audience see (because you just name any card). But it's ok, because the real purpose is to see the bottom card on cards deck, the one that you flip before.
Figure 4.1
This is what your audience see (front of the deck)
Figure 4.2
This is what you see (back of the deck)
After "make a mistake", give your audience a "doubt face" then say "Am I mistaken", make an apology and say that your concentration has been distracted and you want to try it again.