Using the `/questions` method, I tried to get upvote and downvote counts, along with question Ids.  [This is the request][1] I sent:

    http://api.stackexchange.com/2.2/questions/857455%3B857454?site=math&filter=!w-1qg-_wOmTqzZSU1Z

The `last_activity_date` is returned despite being excluded by the filter. I re-checked on the [docs page](http://api.stackexchange.com/docs/questions-by-ids)  that the filter `!w-1qg-_wOmTqzZSU1Z` indeed excludes last_activity_date parameter. 


  [1]: http://api.stackexchange.com/2.2/questions/857455%3B857454?site=math&filter=!w-1qg-_wOmTqzZSU1Z