When traveling to Chicago, a map is used to show their travels. There is an overlay of the Sears Tower. The Sears Tower construction was started in 1970, but the time line of this episode was 1969.
The calendar in the bank says it's Thursday the 9th. In the following episode it's stated that the action is taking place in October 1925. October 9, 1925 was a Friday.
The wreckage of the wave rider has no wires or lights or anything electrical.