If you are talking about a half a quart or so it probably isn't any issue at all. I did a real bone head move once: I have a pair of engines on my houseboat. I was changing the oil and got distracted somewhere between draining the oil between the first and second engine. Then I added the expected amount and fired the engine up, ran them for a minute and checked the oil. First engine was fine, second engine had oil to the top of the dipstick! Oooops! Guess I forgot to drain that one first! I drained the oil down to the proper level and everything was okay. I would expect that the worst thing that too much oil would do would be to cause excessive oil burning. It is also possible that the oil could foam up and "puke" out the vents, creating an oily mess all over the engine. I would not expect any problems with seals, gaskets, lifters, etc. Regarding your lifter tick: Does it just tick for a few seconds on startup and then quiet down? If so, then I wouldn't worry about it. If it continues to tick then you need to replace the lifter.
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