Yeah, Grace (and the area code displayed is 312 - Chicago). The Edie McClurg/secretary character; but it sure didn't sound like McClurg's voice. Nobody but McClurg has McClurg's voice (I think it's Sarah Jessica Parker as the caller, but I'm not certain).
Did you notice that on the roller coaster, a guy in the seat behind them is wearing Cameron's Red Wings jersey? And in the museum, you'll just barely see a guy wearing Ferris's leopard-print vest and green beret?
Or check out the license plate on the car compared to the license plate in Ferris Bueller.
The office of the guy who calls him has the horse chair and lamp from Ferris's bedroom in the movie. And he's tossing a baseball and catching it, and he appears to have Ferris's bottle of cold pills on his desk.
And there's a rabbit's foot on the keychain when you see the key in the ignition - like the one Ferris and Cameron were rubbing when on the floor of the car.
I watched it and stopped the frames a bunch of times. I have at least twenty other Ferris Bueller references.
Did you catch the "Honored Guest" sash? The guy in the trench coat playing the clarinet? The homage to "I could be the Walrus . . . " comment that Ferris made about having a car, mixed with the way Ferris stared at the painting in the Chicago art museum? The white-fringed jacket?
Yep, I noticed most of that (didn’t see the lamp); took three viewings. Where was the fringed jacket?