Jack stated that their new identities would correspond with their original ones, yet Diane is repeatedly prohibited from flying because of no license.
When Ianto takes the group to Asda, there is a sign advertising a DVD saying "Out 17 July!" However this episode is set in December. There are also leaves and blossom on the trees.
At the end of the episode, when Gwen is waving goodbye to Emma at Cardiff Bus Station, the trees opposite the terminus are fully leaved, and people are walking past in short sleeves. This episode is set at the end of December, but was clearly filmed during the summer.
Diane Holmes says that Amelia Earhart disappeared in 1932. She actually disappeared on July 2, 1937.
Emma did not seem to notice when Ianto continually updated her shopping balance with decimal currency. In 1953, Britain used a non-decimal currency.