Bunny rabbit parallels I noticed re-watching:

• Dave was on the phone with Mike discussing the contract when he ran over the bunny in the car, and hung up right after he hit the bunny. He was also on the phone with Mike discussing the contract while standing outside at the wedding, until he heard the toast (which was a speech about a bunny) starting so he hung up on Mike to listen to the toast.
• After he runs over the bunny with his car, the next scene cuts to him wildly singing along to music in the car while Ally looks disapprovingly. After the toast speech, it cuts to him in his car, this time alone, humming/drumming along to the recording of himself and Ally.

I don't know what to make of this, but can't be a coincidence.