Kirsten had a giant bruise and cuts on her forehead as well as a black eye from her accident which have mysteriously disappeared in the few days between finding out Caleb died and his funeral.
Before Ryan confronts Trey at his apartment about what happened between him and Marissa, Trey is tucking away a gun under a pillow. Under that pillow is also a thin packet of some sort and next to the pillow is a section of the newspaper laying flat on the couch. They begin to scuffle and Trey reaches for the gun, pushing away the pillow to get it. At this point that small packet is no longer there and the newspaper is placed perfectly standing up against the back of the couch.
When the doctor from the rehab center is at the house performing the intervention for Kirsten he asks everyone, by their first name, to say something. Hailey is there and at this point she has never met the doctor, yet the doctor calls her by her first name. This is easily explained as Sandy could have told the doctor that Kirsten was out with Hailey, and when they got back the doctor would know who she was.
The phone in Trey's apartment was a mobile one, but in this episode, there's a wired one, witch is heavier to hurt Ryan.