In the billiard game between Crockett & McCarthy the #1 ball (yellow) is pocketed three times.
Between 17:54 and 18:00 (on the Blu-ray) the singer-guitarist is vocal miming, though the music is not playing anything with singing/vocals.
The band playing at the party has none of their instruments plugged in. Also, the audio features a full drum kit, but the only drums visible are guys playing on snare drums.
At 41:17 - 41:21 (on the Blu-ray) the camera reveals the boat it is aboard while performing the tracking shot for the boat race.
This again happens at 42:09 - 42:18 and at 42:58 - 43:00. This is all observed in the bottom-right corner of the screen.