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Continuity
During Metal Beard's tale, the first time they show the Relic Room there is a gummy bear on the pillar between the floppy disc and golf ball, and there is a highlighter behind the golf ball between the key and pen cap. When they zoom in on the battery, it's sitting where the highlighter was and a bottle of white out is where the gummy bear was. (In scenes with Lord Business and Good Cop/Bad Cop, it consistently shows the white out and highlighter in those spots.)
The glue on Emmet's back disappears and reappears between shots.
After Bad Cop shoots the tracking device onto Emmet's leg, it disappears immediately in the next shot. It suddenly reappears when convenient for the plot.
WyldStyle and Uni-Kitty are seen falling out of a spaceship with space clothes on, and upon their landing are cornered. The next time they are seen they are still cornered, only wearing their normal clothes.
Emmet's "hair" goes from having a seam down the middle (where the two halves of plastic were joined), to being seamless several times throughout the movie.
When Emmet goes to buy overpriced coffee, Larry the Barista says, "That's 37 bucks." In the background, there's a woman in a Fabuland T-shirt next to the window. When Emmet replies, "Awesome!" she has moved a (Lego) meter forward and someone is opposite her.
President Business's map of the land (shown after Wyldstyle tells Emmet the history of the partitioning) spells one sector "Pharoah's Quest". Not only is this a common mistake in English, it is also not the correct name of the Lego product, Pharaoh's Quest.
Rainbows have have the longer wave lengths (Reds, Oranges) on the outside of the rainbow and the shorter wave lengths (Blues, Violets) on the inside of the rainbow. The rainbows in the movie are reversed with the Reds on the inside and the Blues on the outside.
Just before the meeting begins, Superman flies away to go back to Krypton. But when Vitruvius begins listing the attending Master Builders at the start of the meeting, he is seen near "Mermaid Lady,". This is because he was just avoiding Green Lantern. He returns moments latter through a window in the background as Emmet and the rest of the party enter the hall.
When Benny and crew escape Lord Business' tower, the ship that breaks through the wall is made of only three small bricks before momentarily leaving the shot and returning as Benny's Spaceship and crew.
Also, on the film's Academy Ratio/Open Matte (1.37:1) version, some of the Security Footage text has been cropped off instead of being repositioned into the intended 1.85:1 area.
On the Academy Ratio (1.37:1)/open matte version of this film, when "The Old West" appears on the screen, it is off-center.
When Emmit runs by in his giant construction-themed robot, WyldStyle and Unikitty shout, "Emmit!" - but their faces and mouths do not move to acknowledge him.
Near the end when Emmet makes it to the fight in Bricksberg, all of the characters are cheering for him and Unikitty is heard speaking as well. However, her mouth is not moving to match up with the audio.
Throughout the movie, Vitruvius clearly sees certain things happen and looks directly at some characters, even though he's supposed to be blind.
When Emmett is listing off all the names of Sherri's cats as they exit the building, there is one more cat after Jeff who is missed and does not get his name called.