IMO that is why there is a cleaner spot under the window and to the side below the window where someone boosted him up to open the window and snack in.Initially, Jake used a knife to try to pick the lock on Frankie's trailer door. IIRC, the tip of the knife broke off in the lock and then Jake had to get in by climbing in an open window. JW then opened the door to let Billy and George in.
JMO
it was mentioned about grass under the window next to the ac unit. I’m wondering if any foot prints were found there.