Continuity: In the first Hellboy movie, when they first show the BPRD headquarters, it reads "Newark, New Jersey". In Hellboy II, they show what is clearly the same highly distinctive building, but it now reads "Trenton, New Jersey".

Continuity: After the golden army bots awaken, it zooms out to show how big the army is, when they do the prince and princess disappear in the background, then reappear.

Continuity: When Abe is with Princess Nuala for the first time at the goblin market, the amount of flesh coloured skin on Princess Nuala's face constantly changes.

Continuity: The amount of "Tooth Fairies" at the start constantly changes. Also, the amount of the creatures visible are too many to be in the box that Prince Nuada and Mr. Wink took.

Continuity: When Hellboy is climbing the "Hotel" sign, the letters that have been damaged change.

Continuity: After the bloke drops the bean to deal with Hellboy, the amount of flesh coloured skin on Princess Nuala's face constantly changes. (This is a different scene than the one at the market when they meet her for the first time.)

Continuity: When Hellboy has been speared in the chest and fallen to the ground, the POV shot of Nuala and Nuada has been turned so their heads are at the right hand side of the frame – from Hellboy's point of view their heads should be to the left.

Continuity: The first time you see the Prince Nuada out of puppet form, there is a continuity shift on his hair when he slams the spear on the ground.

Continuity: In the scene where Hellboy and Abe are getting drunk by Liz's bed, one shot shows the tab on HB's beer can pointing up. In the next shot, the tab is folded down.