After Ted walks out the apartment door to buy dip, Marshall turns around and his dressing gown is tied loosely around his waist. The shot then changes to Lily, but when it shows him again, the dressing gown is tied tightly around his waist, even though there was no chance for him to re-tie it.
When Robin is reporting from "The Razzle Dazzle Supermarket" on 75th and Columbus to cover the child stuck in the prize machine with the purple giraffe, as she's signing off you can hear her director yell "we're clear" and the child stops waving and eases down as if it were scripted for him to do so (giving the indication that it wasn't in fact a genuine accident that Robin/Metro News 1 was covering, but a in fact a scripted one)