The Extreme Ghostbusters phone number is presented as 212-555-GOST (212-555-4678). This is a new number. In the The Real Ghostbusters, 555-BUST (555-2878) and NO-GHOST (664-4678) were used.
The date and time on Garrett's laptop screen are 4/7/97 and 10:00 am.
The two FBI agents are named Jack Stone and Harry Gannon. The names are a reference to the two lead actors and characters from Dragnet 1967 (1967): Jack Webb, who played the stone-faced Sergeant Joe Friday, and Harry Morgan, who played Officer Bill Gannon.
Police officer Al, who previously appeared with his partner Frank in Fear Itself (1997), The Unseen (1997) and Be Careful What You Wish For (1997) ushers the Ghostbusters out of the US Online Computer building after the FBI agents arrive on the scene, and is identified by name by Garrett. Al will appear next, again partnered with Frank, in Glutton for Punishment (1997).