Audio problem: In the bar scene where the twins are dancing with the girls, keep an eye on the band in the back. The singer and the guitarist are not always singing and playing in time with the music. Most visible at the end of the scene, the music has the guitar playing a long riff and no vocals, yet the guitarist is barely moving, and the singer is singing with emotion.
Audio problem: When Vincent is receiving the parking ticket for being in the handicap spot, at one point we hear him say "Handicap my ass" but his mouth is not moving. Clearly dubbed in later.