When Tony and Doug are leaving the house at gunpoint it is getting dark outside, yet next when the Time Tunnel view shows the ships at sea it is clearly daylight.
During the attack, Tony is knocked out by a flying piece of debris and is shown lying flat on his back. A few minutes later, just as he regains consciousness, he's lying face-down and on the other side of the street.
Scenes of the attack viewed through the tunnel are black and white while all other scenes are in color. Why would just these be in black and white? Stock footage used which is only available in monochrome.
There is a California license plate on the car parked in front of the Japanese consolate.
Young Tony is wearing canvas sneakers from the 1960s.
When Tony is hit in the face with a plank of wood, you can briefly see the hand of the crew member who threw it at him on the right side of the frame.
In Rendezvous with Yesterday (1966), Tony told Captain Smith that he was born in 1938. However, in this episode, he tells Doug that he was seven years old on December 7, 1941, the day that Pearl Harbor was attacked.
Tony tells Doug that his father was a Lieutenant Commander. However, when Commander Newman walks into the Neal home in dress uniform, his insignia tells us that he is a full Commander.