During the pool party, Jim says that he is blocked in by Meredith's car, pointing to him getting there and Meredith arriving after him, however Meredith can be seen poolside before Jim arrives.
At approximately 13:22 in the episode "Pool Party," the wine bottle prop is clearly labeled "Oscar" on the bottom of the bottle. Masking tape and a sharpie helps assure continuity in the character props.
Near the end of the episode, when Ryan and Gabe undress to join Robert California in the pool naked, Kelly is heard telling Ryan to "Stop it!". But when a wider shot of Ryan and Gabe is revealed, Kelly is seen in the background wearing a purple dress, clapping and cheering them on.