In this episode the date seen on the computer in Gene's office is 17th July 1981, but when at the end of episode 2 Alex sets out her table of months leading up to 10th October 1981, the day that her parents are killed, which is seen throughout the rest of this series, she has marked 20th July with the word arrived circled in red, meaning the date on the computer in this episode must be an error.
In one of the wide shots in the storeroom, on a shelf to the left of shot we see a Commodore 1530 Datassette deck, this is of the later Commodore 64c era design dating it to around 1986/87.
In episode 1, Alex is supposed to be back in 1981 yet there is a scene at the river, where a Hackney cab with a modern registration introduced in 2001 is briefly seen on the rear plate as MM.
The Sony BMC 100/200 video cameras seen in the storeroom were not available until 1983.