When the NYPD officer gives the Glock handgun to the female party goer (at the pool party) he states, "It's safe, the safety is on." Then proceeds to manually "click" on the safety. Glocks do not have external safety toggle switches of any kind.
When getting the alcohol for the party, the cops say "Leave the Syrah" but then take a bottle of white wine (probably chardonnay, by the bottle shape).
When Danny gets home from the party he hangs his bicycle on the fence. During the scene the position of the bike moves several times (on the fence and on the ground). when Danny leaves the house again the bicycle has disappeared.