Michael Constantine, who previously portrayed the family's patriarch Gus Portokalos, sadly passed away in 2021. He gave the movie his blessing before his passing. He told writer and director Nia Vardalos he wouldn't be able to join them for the third film and his wish was that they went on. "I wrote the screenplay to reflect Michael's decision and will always treasure his last messages to me, hoping we were filming soon," she said.

Michael Constantine, Bruce Gray, and Constantine Vardalos all passed away after My Big Fat Greek Wedding 2. This film is dedicated to them.

Elias Kacavis (Aristotle) wears a shirt that says "The Second City Chicago". Nia Vardalos was a member of The Second City comedy group at the beginning of her career.

This movie takes place only one year after the events of My Big Fat Greek Wedding 2 (2016).

First film that doesn't feature Ian Gomez. He and Nia Vardalos got divorced in 2018.

Revealing mistakes

When Toula presents her father's journal to Peter, she opens it to a random page, but then the scene is cut to the next scene, and Peter has to open the journal himself.



Crew or equipment visible

At 51:39 you can see a crew person in the background.



Errors in geography

When they arrive at Greece and exit the airport, the scenery outside is not from the actual airport, but from the center of Athens. Athens International Airport is located 33 km southeast of Athens, at a suburb called Spata.

At the start of the film, the family is flying from Chicago to Athens. As they are outside the airport, the yellow cab has a New York tag.

When they finally arrive on that small ferry boat to wherever they were going or which island? it shows a small scene from the port of Agios Nikolaos City in Crete, Greece.