When Darryl is inviting Val to the upstairs party, he is wearing red tinsel around his neck. During the scene his shirt collar swaps from being tucked under the tinsel, to being flapped up and over the tinsel, back and forth a couple of times.
When Jim reads his credit card information he lists 12 numbers and the security code. All credit cards are 16 digits, and Dwight would never had been able to commit fraud without the expiration date, which Jim never provided.