Agent Bond interrupts his conversation with Agent Phillips via walkie-talkie (because Rob was listening), but those devices use push-to-talk. Agent Phillips would not know that Agent Bond was speaking until he stopped transmitting. (However, Agent Bond's premature transmission had the effect of stopping the reception of Agent Phillips' insult of Rob.)
The layout of Ritchie's bedroom is all wrong for looking out front of the Petrie house. For one thing, there is an entire guest bedroom blocking it. When Rob and Harry exit the room for the front door, they turn left instead of right, which either puts them in the kitchen or suggests Ritchie's bedroom is approximately right where the kitchen is located.
Rob tells the agent at the beginning that the Helpers live across the street, and later on he tells Bond they live next door.