When Jean's phone rings, you can hear the X-Files song theme. Gillian Anderson is known for her part in X-Files: Dana Scully. EDIT: The ringtone is a stock ringtone from Verizon but bears similarities to The X-Files theme song.
Alistair Petrie (head teacher Michael Geoff) slides into the school hallway to the tune of Bob Seger's 'Old Time Rock And Roll,' the same way Tom Cruise does in Risky Business (1983).