Weirdness after moving pages & page assignments to sandbox

Just moved pages and page assignments to a sandbox, and I’m having lots of strangeness. This calendar, for instance:

And I’m getting this javascript error on many pages:

What might I be missing?

You must be missing an object or custom setting in the sandbox. Same version of Skuid? Any objects in production that aren’t in the sandbox?

Thanks, Pat. Missing a custom setting, and missing some data that my models needed.