Actor Ed Oxenbould is obsessed with Australia in the movie and in real life he is from Australia.

Baby Trevor is played by twin baby girls

The crocodile at Alexander's birthday party is very obviously an alligator. The reason was due to the fact that alligators are far less hostile than crocodiles, and therefore are far less dangerous on set to both handlers and cast/crew.

There is an Easter Egg on the Bluray Disc: Go to the main menu, select "Bonus Features," highlight "Alexander...in Real Life" then press the right arrow on your remote to make a kangaroo appear. Select the kangaroo and it will play an animation of the story "Who's Ready to Take a Dump on the Potty?" narrated by Dick Van Dyke.

In the book, whenever something goes wrong, Alexander vows to move to Australia to get away from everything. In the movie, Alexander is an expert in all things relating to Australia. Ironically, Ed Oxenbould (who portrays Alexander) is an Australia native.

Denison University got to have a special showing for students only on opening weekend to honor the two Denison stars in this movie Steve Carell and Jennifer Garner.

Steve Carell and Jennifer Garner both went to Denison University in Granville, Ohio. Carell graduated in 1984 and Garner graduated in 1994.

Throughout the movie, Emily sings "You Can Fly" from Peter Pan (1953). This song is only featured in the Walt Disney cartoon, not the conventional stage musical of the same story, which has "I'm Flying" instead.

The book title and premise is based on a very popular school book by the same name. This book is part of the year 1 australian curriculum.

In House (2004), when diagnosing Jack's condition, House says that while chicken pox is not so bad for children, in adults it can be "terrible, horrible, no good, very bad" which is almost definitely a reference to the children's book, (later a film by the same name) "Alexander and the Terrible, Horrible, No Good, Very Bad Day'.

In this movie Dylan Minnette and Kerris Dorsey play siblings but then began dating shortly after the movie came out.

Based on the children's book of the same title by Judith Viorst.

There are three actors with the first name of "Dylan."

Kelly tells Ben to "stop drop and roll" when his shirt is on fire. This is shortly after she had met Dick Van Dyke, who appeared for years in fire safety P.S.A.s promoting "stop drop and roll".

In the first car scene, the song that they are singing is "Whats Up" by 4 Non Blondes.

In the book or cartoon, Alexander was the youngest and had only two brothers, Anthony and Nick but in the movie Alexander was the 3rd of four children where he had two brothers and a sister. One of the brothers and the sister is older. But the other brother is younger. Their names are Anthony, Emily, and Trevor

Dylan Minnette plays Anthony Cooper. He also played Zachary Cooper in Goosebumps.

Bella Thorne plays character Celia; in Shake It Up (2010), her character's name is Cecelia.

Lisa Cholodenko was set to direct the film, but dropped out in February 2013.

The plot is very similar to that of Liar Liar (1997). A boy makes a wish and the wish comes true. Bad things happen to those who were wished upon. The difference is one is a family and one is a husband.

Dylan Minnette played David Shepherd on ABC's Lost (2004). His character's name in this movie is Anthony Cooper, which is the same name as the character in Lost played by Kevin Tighe.

The plot is very similar to that of Nickelodeon original movie Jinxed (2013).

Dylan Minnette co-wrote 'Surf Surf Don't Drown' for the movie's soundtrack, along with his band Wallows (known then as 'The Narwhals').

The premise is quite similar to the 1997 film Liar Liar starring Jim Carrey where the character's life is a pure disaster and makes a wish for 24 hours.

The scene near the end where Steve Carrell's character says to the male strippers at Alexander's party "Guys keep it PG" while Jennifer Garner's charctherwas in a fit of laughter was actually ad-libbed.