I noticed a bug where my spider familiar gets skipped in combat. The spider was sharing initiative with my wizard, but I could never switch to the spider and when I ended turn it skipped the spider. This happened for two turns in a row before I regained control of the spider, and it occurred right after I summoned the familiar into combat using the find familiar spell, replacing mage hand.

Also, I noticed that mage hand and the familiar cannot both be brought into play by the same wizard simultaneously. I don't know if this is intended but it is kind of disappointing.