Goofs

When human-height Susan is skiing up the hallway through the holes she made in the doors as Ginormica, she is more than half the height of the holes instead of roughly 1/10 as was established in the church scene.

In the beginning, when the president is walking up the stairs to the alien, a camera view shows that no one is on the stairs with him. When the president gets toward the top a man gives him a cup of water. A second later he is gone.

When the Insectosaurus pupates, we suddenly see he's encased in a cocoon - however, since he's been rendered unconscious he wouldn't have been able to spin this from his silk.

Ginormica kicks off the roof covering the gas pumps (sending B.O.B. flying). Later in the movie as Link is mourning over Insectosaurus, we see the gas station in the background the the roof is back in place over the pumps.

When Susan first transforms in Genormica, as a side effect her hair turns white. However, when she gets back to normal by Galaxar, her hair remains white instead of being brown again.

However, one does not know all the effects and side-effects of the substance from space.

When Ginormica goes to the TV station to see Derek the call letters on the building begin with a W. All broadcast stations east of the MS river start with a W. West of the MS river they all begin with K.

The list of songs in the closing credits includes, "Here Comes the Bride - Traditional". In fact, the title is "Bridal Chorus", and was written by composer Richard Wagner for the opera "Lohengrin".

Before setting the alien spaceship on self-destruct, Dr. Cockroach says, "A hexadecimal color code system." This represents 16 colors. The actual color system had nine colors and therefore would be a nonary color code system.

Monsters vs. Aliens (2009)

Mrs. Diegl explains that she has one thumb shorter than the other, but not to worry because it skips a generation. This is untrue. The condition, known as Brachydactyly Type D, a birth defect, can happen in one or both thumbs. The recurrence is 50/50 in all offspring.

The grown-up version of Insectosaurus would not recognize his friends. This is because a caterpillar does not simply transform into a moth (or a butterfly); once its chrysalis has formed, the caterpillar dies as its body breaks down into a nutritious goop and some useful spare parts for a separate clump of cells. These have remained dormant since they were part of the original embryo, but now they wake up and grow into the insect's adult form.

When Susan takes the monsters to her parents' house, they start acting strange. It is odd that Dr. Cockroach would not know how to act, since he was once a highly cultured human with a high IQ. However, he is shown more than once going with his cockroach primary instincts rather than behaving like a human.

Ginormica's prison uniform is numbered 00005. But since she clearly arrived after Dr. Cockroach, BOB, Link, Insectosaurus, and the Invisible Man (R.I.P.), she should wear number 00006.

However, one could argue that The Invisible Man was given number 00000 as he did not require a suit.

When Susan shoots the orb on top of herself, she doesn't have her Ginormica strength. Unless the substance inside of it has healing abilities (as in Wolverine or Deadpool), the sheer weight of the orb would crush her.

However, one does not know all the effects and side-effects of the substance from space and just as she was not crushed by the meteorite, she is not crushed by the orb as well.

When the President plays the Close Encounters of the Third Kind (1977) motif on the synth, he's playing in the key of C, but the music heard is in the key of F.

The yellow convertible Susan uses as a roller skate to escape the robot appears to be a 2005 to 2009 Ford Mustang GT as evidenced by the design and fog lamp location however, you hear what appears to be the engine for a few seconds which sounds like it is a V10 except all '05 to '09 Mustangs used a 4.6 L V8.

When Gallaxhar's computer is showing the location of the earth, it shows the Milky Way, and zooms near the center; actually, the solar system is a lot farther from the center, nearing the edge.

After Derek completes his TV weather forecast, a director can be heard saying "cut". You don't "cut" a live TV broadcast: this is a film term. The correct term should be "we're out", (meaning off air) or just "out".

When General W.R. Monger tells the agents about the monsters, he does not mention the Invisible Man that The Missing Link says died of a heart attack.

While Dr. Cockroach is experimenting on Ginormica, Link mentions that they've been doing this for over a month. Later, however, Ginormica mentions being in prison for only three weeks.