Angel and a demon gambler both cut a card from the deck. The gambler cuts first, his card a 9 in close-up shots. In the long shots of the table, though, his card becomes a 5.
When Angel cuts the deck (in the long shot), he has a black Three. In the close-up, it has become a Three of Hearts.
Flashbacks establish that Gunn knows demons exist in L.A., but in Angel (1999) {Guise Will Be Guise (#2.6)}, he wonders how he could have lived in town all his life without knowing all the "weird-ass stuff" going on.