Except for a few anomalies, it makes perfect sense how they came up with their sequence. They surrounded the dollar with the lowest odd amounts, then they picked the highest remaining even amounts on either side and so on. I would've done it consistently though and had:
.10, .85, .30, .65, .50, .45, .70, .25, .90, .05, 1.00, .15, .80, .35, .60, .55, .40, .75, .20, .95
(Nearly identical to the actual wheel, they simply swapped .55 with .20 and .50 with .10.)
Even as a kid it bothered me that they had 3 even amounts in a row followed by 3 odd amounts, not only was it inconsistent but it wasn't aesthetically pleasing.