In the episode "That'll Be the Day," Jack records Kate singing. When he takes the tape out, it is a VHS-C tape that is put into a full-size Adapter. When the tape is damaged in this episode, it is a full-size VHS tape.
In the ambulance, Rebecca is holding a red photo album. In the next frame, she is holding a green album.
When Rebecca tells Kevin that she heard the same song on two different radio stations, the first station is 103.4. All FM radio stations in the US end in an odd number.
Jack dies on Super Bowl Sunday 1998 which was January 25. Rebecca, Kate, Randall and Kevin all call Super Bowl Sunday 2018 the 20th anniversary of his death even though sin 2018 it was on February 4 so it would have been more than a week after the actual anniversary.
During the 2018 scenes, during Rebecca, Kevin and Randall's family scenes when the Super Bowl is being played, it is shown as being in daylight during the late afternoon. In the eastern time zone where Pennsylvania and New Jersey are located, the Super Bowl begins after sunset when it would be completely dark outside.
Kevin phones Rebecca to tell her he's at Jack's tree. The tree is located in Pittsburgh. The show has inferred that Rebecca lives in the NYC metropolitan area. It's highly unlikely Kevin could have driven from the NYC area to Pittsburgh (6+ hours driving one way) and back, been at the tree during daylight and home to share food with Rebecca on the first Sunday in February.