Big Nate the Movie - The Prince and the Party Pooper/Parents Guide

Certifications
Rated TV-PG for moderate language and thematic elements.

Mexico: A

Canada: PG

UK: 12A (with censors)

Malaysia: P13 (with censors)

Sex & Nudity
There are some scenes where people are shirtless, but nothing sexual is seen there.

There's also a bit of offscreen kissing.

In the scene where Nigel threatens to post online photos of Ellen's embarrassing memories, one of them is of when Ellen lost her bikini in the city pool, though NOT explicitly shown.

Violence & Gore
There is a some cartoonish and moderate violence (i.e. physical confrontations), but no blood, except for a nosebleed from Nigel's fight with a school bully that got Nigel expelled.

There is also a death threat, when Sir Gastley sentences Nate to execution ("OFF WITH HIS HEAD!!").

Profanity
People say the word “sucks” or “freaking” sometimes in the film.

Also used are words censored in the UK such as "git", "bloody" (those two said by Nigel and Sir Gastley), "spaz" (said by Ellen), and the V-sign insult (accidentally done by Nate).

Some uses of God's name in vain.

Alcohol, Drugs & Smoking
Sir Elton sometimes has a cigarette.

UK

 * Many "overly rude" scenes were toned down due to...well, rudeness.
 * Many "overly polite" scenes were toned down due to British stereotyping.
 * In the scene where Nigel threatens to post online photos of Ellen's embarrassing memories, the part where he mentions when Ellen lost her bikini in the city pool was removed.
 * The blood from the school bully's nose injury caused by Nigel during the fight was digitally removed.
 * The scene where Sir Gastley sentences Nate to execution ("OFF WITH HIS HEAD!!") was cut.
 * All instances of the words "git", "bloody", and "spaz" were replaced with "jerk", "blinking", and "brat", respectively.
 * Both instances of the V-sign insult were blurred.
 * Sir Elton's cigarette was digitally removed in all scenes that show it.

Malaysia
Also using the UK edit, but with a couple extra censors:
 * The offscreen hugging and kissing was muted.
 * ”Holy cow! Major P.D.A.!” was shortened to just “Holy cow!”