Staying with T.N.T Jackson, Rodney also identified a location I hadn't put up a screencap for but was looking for anyway. He's a mindreader!
This is the movie theatre that Stan Shaw supposedly goes into. The establishing shot used the exterior marquee of the Hollywood Theatre, located on the corner of Soy Street and Sai Yeung Choi Street South. So, actually right next to the previous post. I suspect, but can't confirm, that the cinema interior used in the film was actually one in the Philippines where much of this movie was shot. I say this because it looks far too big to have been a Hong Kong cinema and many of the extras appear to be Filipino rather than Chinese.
In what appears to be an informal convention in Hong Kong, the cinema's name is remembered by the building that replaced it - 'Hollywood Plaza'.
Again, here is Rodney's comment:
Right after the second screencap, Charlie (Stan Shaw) walks into the Hollywood Theatre on Sai Yeung Choi Street and Soy Street. The word "Soy" on the street sign attached to the exterior of the theatre is (barely) visible when the camera shows Charlie looking up at the billboard for the Shaw Brothers film 'The Golden Lotus'[金瓶雙艷].
IMDB does not list any filming dates, but 'The Golden Lotus' premiered in Hong Kong January 17 1974.