As Cat begins the phone retrieval feud, she had taken the box from the desk Sikowitz was sitting at and it got flung in the chaos.
During the following shots as Sikowitz watches the fight with fascination, the box had somehow reappeared on the desk despite the direction it was flung in.
Cat only cracks the glass for the emergency. In the next shot, the glass is completely missing.
When Robbie drops the cell phone, it lands back side up (blue). No one touches it, but in the next shot, it front side up (black).
When Cat is tied to the leash, the sweater that she is wearing changes from over her left shoulder to off her left shoulder then back over in between shots.