This could be fixed in five to six easy steps, actually.
---I) "Clear" the weight paint off of both ears
---II) Delete one ear; reposition the remainder
---III) Apply a "mirror modifier" and adjust/modify the remaining ear (mirrors automatically follow edits to the mirrored ear)
---IV) Re-apply the armature/skeleton to the non-mirrored ear with an x-axis mirror applied so both ears will be rigged to corresponding bones
---V) Test animations of the rig with ears; make according changes
---VI) Apply the "mirror" to turn the "reflected" ear into a solid one.
Save and you're done.
Also, seeing as the expressions are more or less "frozen" to that specific expression, all that would be needed is to "duplicate" the snarl/growl/whatever emote that is (since I can't remember it) and then adjust the jaw until it's in a more realistic position.
30-60 minutes of work for decent to really good people with a good reference photo or two.