When Beth sets the alarm on the house, she says, "We've got thirty seconds until this place self destructs," stating that's how long she and Randall have to be out of the house before the alarm will be set. From the time Beth sets the alarm to the time she and Randall have closed the door and the alarm electronic voice says "alarm set" is approximately forty-three seconds.
When Dr K is sitting alone at his office holding his daughter's picture and whispering "Blue skies" song, a PC monitor appears on his desk.
The scene is set in 1981, when the Big Three have just turned 1 year old. In 1981, most physicians offices were still primarily paper-based.
At 34:30, when Kevin follows Randall back into Kate and Toby's house, they pass a mirror next to the Young Frankenstein poster. The cameraman and camera are clearly visible in the mirror.