Continuity mistake: After the car chase, the front plate of the taxi is hanging on one side. Moments later, while driving the cab and fighting the other "alien," the plate on the taxi is in a different position (semi-fixed). (00:46:00)
Continuity mistake: During the car chase in the beginning, we see that the driver's side mirror is gone, then back, then gone again. Later after exiting the scene, we see the taxi leaving with both side mirrors on it.
Continuity mistake: When Seth and Sara are captured outside Witch Mountain, the amount of stubble on Jack's face changes. It's all down his jaw line and on his face, and then is only on his chin and lip. (01:11:50)
Continuity mistake: In the desert, throughout the chase scene between the black SUVs and the taxi, the damage on the front bumper constantly changes. It 'fixes' itself several times, most notably on the left side. (00:15:00)
Continuity mistake: When driving the taxi in the tunnel, after Seth says "faster", there's a shot of the tripmeter which reads "308.6." When Sara accelerates the car, the tripmeter reads "312.3."
Answer: It was either Southern Night or Boogie Woogie Saturday Night.