It has been suggested by some that it is OK to support the engine with a jack under the oil pan for jobs like changing the engine mount. Personally I have never felt comfortable with this although I may have done it... using a big plank between the jack and the oil pan.
While cleaning my oil pan today I found multiple cracks around the drain hole and around the indentation for the oil intake. There is no evidence that the pan hit something although perhaps it somehow took a glancing blow.
This engine always seemed to have a bit of oil seepage on the oil pan, although not enough to drip.