The second clip with Mickey's jalopy, and the last clip where they both do the voice of Mickey... that's Wayne Allwine, who was Jimmy's assistant, then a SFX editor in his own right, and the voice of Mickey Mouse for 30+ years.
Best to have your own studio: all that junk, and worse for footsteps sometimes. We had portable pits which we took to a new stage (which was offering a cheaper price). They had no idea what Foley was and regarded us as nutcases. A failed enterprise & back to the old joint, worth the extra fee.
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Wayne was my friend.