[bav]

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1. One large denomination chip is released into the pot and even if the amount would consitute a legal raise, it is ruled a call.

2. Two chips are released into the pot such that while the amount does consitute a legal raise, the circumstances appear, and are common, that the intent of the player was to call.

In both of the above instances, a player would have to verbally state raise, and then release the chips into the pot. Otherwise, they are both considered calls.

Are there any other circumstances like this or are these the only two rules regarding calls and non-verbal actions?

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You made #2 a little too specific. It isn't 2 chips released into the pot which is the trick. Same basic issue would apply if a three chip bet were ambiguous. An example:

$1 SB, $3 BB, raise +4 to $7, raise +4 to $11. Next guy silently puts out 3 $5's. Once again, ambiguous...he could be intending to raise to $15, or he could be intending to call.

If the chips you put into the pot in one motion are of such a mix that you cannot remove a single one and have enough left to cover a call, you called, even if the sum of the chips you put out is also enough to legally raise.