When Gilroy indicates to Michael that he sees Fiona on the balcony, you see the bottle of champagne next to her. When the sniper shoots that bottle, there is suddenly a glass next to it that clearly survives the shot. When you next see Fiona, the glass is gone.
At 00:24 when Omar and Felipe are talking, Felipe's "associate" breaks a window but just before he does you can see the window ripple slightly and tell that it is already broken into hundreds of pieces.