Here is fantastic bit of acting reference from the production of Disney’s Alice in Wonderland, featuring the greats Ed Wynn, and Jerry Colonna. More evidence of what great comedic actors can bring to animated charaters. Look at this reference, and compare it to the recording booth videos of big name stars we see today. These men get in costume and use their full talents. The Youtube title says they used the actual audio from the reference.
The poster image for the clip shows a split screen comparison of Jerry Colonna and the March Hare. I notice they followed the basic hand gesture he used, but changed their relative position in order to get a better silhouette.