Edwin Hodge plays The Homeless Man in the first purge that the son lets in. He is also in the second movie. He is the same character and he saves the group at the Wealthy People's Party. He is part of the group that try to defend the less wealthy people.
Sargeant listens to the radio in his car, a 2011-2014 Dodge Charger. He shuts off the radio by pushing the "Screen Off" button. In reality this would shut off the screen only but leave the radio playing.
When the group goes to Tanya's house, the door is locked, and Tanya opens it. After they leave her apartment, the Seargent goes outside to check on the situation, and comes back through the door, unlocked. The next scene involves the team using a saw to cut the bolt on the door.
Big Daddy: We found your car Sergeant. Your plates told us who you were. It was easy to see where you were headed tonight. Hell, I would've done the same thing. The unwritten Purge rule: don't save lives. Tonight we take lives. We make things manageable. Unfortunately the citizens aren't killing enough. So we supplement it all to keep things balanced. It's important work the NFFA does and we can't have any interference. We can't have heroes... oh no sir... no heroes. I hope you feel cleansed. Blessed be America, a nation reborn.