EINSTEIN's head
The line just above EINSTEIN's head contains a transparent pixel (shown in green) that should be blank:
To make the pixel blank:
Also, when EINSTEIN is lying down, the line above his head is entirely blank:
To make the line transparent:
BOY WANDER's head
When BOY WANDER is sitting on the floor, there is a blank line above his head:
To make the line transparent:
MR CREAK's ear
MR CREAK's ear is transparent when he's midstride, which means it will appear filled in or blank depending on the background:
To make the ear always blank:
MR CREAK's hand
There is a blank pixel in MR CREAK's walking stick hand when his other arm is raised (below, second and fourth images), but the corresponding pixel is filled in when he is standing or walking (below, first and third images). This difference is most noticeable when MR CREAK is wiping or writing on a blackboard.
To fill in the blank pixel:
MR WACKER's trousers
There are two transparent pixels in the crutch of MR WACKER's trousers:
To make these pixels blank:
MR WITHIT's shoes
There are blank pixels near MR WITHIT's shoes that should be transparent:
To make these pixels transparent:
MR WITHIT's hand
There are two blank pixels poking out of MR WITHIT's hand:
To make these pixels transparent:
MR ROCKITT's coat
There are slight differences between MR ROCKITT's coat when he is standing or walking (below, first and third images) and when his arm is raised (below, second and fourth images). The differences are most noticeable when he is wiping or writing on a blackboard.
To remove these differences:
Big kids' hands
The mask around the big kids' hands in phase 2 of their walking animation (the right hands in the images below) contains an extraneous blank pixel:
The corresponding pixel is transparent in phases 1 (shown below), 3 and 4:
To make the extraneous blank pixel transparent:
Little kid's hand
The mask around the little kid's hand in phase 2 of his walking animation (below, left) contains two extraneous blank pixels; the corresponding pixels are transparent in phases 1 (below, right), 3 and 4:
To make the extraneous blank pixels transparent:
Boys' shoes
In phase 2 of the boys' walking animations, the shoes are filled in, as shown in these unmasked graphics:
But the mask erases the body of the shoe:
To fix the masks:
Score box
The base of the 'o' in the word 'Score' in the score box is shifted one pixel to the left:
To shift it one pixel to the right: