At the end of the episode, Galatea throws a red towel over her shoulder when exiting the gym. This is a nod to the partial red cape worn by Power Girl, who Galatea is designed after.
Beebop, the yellow, green-eyed cat The Flash rescues, is based on Power Girl's cat from the 1980s' Keith Giffen/J.M. DeMatteis Justice League comics.
The unmasked face of The Question / Vic Sage is revealed when Huntress takes his mask off and he is face is bruised up. The Question / Vic Sage's un-bruised face was briefly seen previously when he was posing as a cab driver in the episode Fearful Symmetry (2004).
A few years after this episode aired, the name "Flashpoint" became the title of a limited series comic in which the previous the Flash (Barry Allen) travels back in time to save his mother, only to inadvertently cause major alterations to the timeline.