There are posters for Phil Lynott's "Solo In Soho" album on the wall at The Grove. The album didn't come out until a year later, 1980.
A Rubik's cube features prominently. This toy didn't become generally available until the spring of 1980.
In several scenes there are houses with uPVC double glazed windows; these were not introduced until the 1980s and didn't become common until the 90s.