On the discovery cards, the word "wombat" is misspelled as "Wambat".
In the Blowing Bubbles puppet show, one can see underneath the table and find the bubble blower device that they use to make it look like the bubbles float out of the cup and into the air. It could have been fixed with cropping, but for some reason they chose not to.
During the Ocean puppet show, when Baby Noah drinks the water, the string that's used to hold up his trunk can be seen.