* HeyItsThatGuy:
** [[Film/KickAss Hit Girl]] (or [[LetMeIn Abby]] or [[Film/FiveHundredDaysOfSummer Rachel]] ...or {{Carrie}}) runs the school newspaper in the first film.
** And how nice of [[Series/StargateSG1 Dr. Fraiser]] to drop by for dinner in the second film.
** Greg has [[SurvivalOfTheDead Boy]] as his JerkAss older brother in all three films.
*** Horror fans may also recognise Rodrick as [[{{Saw}} Brent]] or [[SurvivalOfTheDead Boy]] as well.
*** He also portrayed [[VideoGame/AssassinsCreedII Ezio Auditore]] in the live-action short film ''Assassin's Creed: Lineage''.
** Well, hi there [[Series/HowIMetYourMother Ted's cousin and Grant]][[note]]Zachary Gordon has been in two episodes of HIMYM-- ''How Lily Stole Christmas'' and ''The Stinsons''.[[/note]]
** Greg previously played [[NationalTreasure a kid who gave Nicholas Cage a hard time at the White House Easter Egg Roll.]]
** Greg has [[Series/{{Jessie}} Emma & Ravi]] as his {{love interest|s}} and FunnyForeigner [[TheRival rival]], respectively.
* NamesTheSame: Dr. Salazar Kagan, Greg's dentist, while {{depraved|Dentist}}, was [[Franchise/HarryPotter not responsible for founding Hogwarts or opening the Chamber of Secrets.]]
* TechnologyMarchesOn: In the webcomic, Manny breaks Greg's Walkman by stuffing a cookie in the cassette slot. The novel changed it to a video game system.
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