"For a good time, call Allison Wonderland" is real. It's in every version, you don't even need freeze frame to see it.
What's not real is the alleged flash frame of a phone number (supposedly Eisner's) appeating underneath that message. It has been mentioned on the Internet, supposedly it was removed after the laserdisc, but nobody here has found it on the LD or any other version.
The graffiti is real, it was never removed, it's the phone number that's the myth.