OK, here is a start of what to look for if you suspect that a dealer is cheating at single deck:

Sign #1: The dealer has too much eye contact on the deck.
Sign #2: The dealer rearranges the chip-tray in the "middle" of a hand.
Sign #3: The dealer places the deck on the table for a moment.
Sign #4: On the cut, the dealer raises (or moves) deck to force a preferential cut by player.
Sign #5: The dealer preferentially shuffles.
Sign #6: You hear "clicking" sounds and/or noises.
Sign #7: The top of deck is fully concealed by the dealer's hand.
Sign #8: The dealer looks at his/her watch.
Sign #9: The dealer picks up cards in a Hi-Low manner.
Sign #10: The dealer is "too" anxious to hit your hand.
Sign #11: The dealer is bending the cards.

Any more suggestions?