The writers originally said that they weren't going to attach filters and effects onto Tony Todd's voice, like they did last year with the Reverse Flash, but they must've changed their minds, because as of episode twelve, they started using filters and effects.
In the comics, Tar Pit is a Flash villain with a much more monstrous appearance. Monteleone is a meta-human with the ability to astral project his consciousness until it gets stuck in a vat of tar. His brother is the crime lord known as Candyman.
Cisco's phone meta human social media ringtone is taken from 'O Fortuna', a track from 'Carmina Burana' by Carl Orff.
At the start, Barry mentions the song "All the broken hearts in the world still beat". It is Girls Chase Boys, that is a lead single, Track 2 on Ingrid Michaelson's sixth album Lights Out.