I kegged today (3rd time overall). After auto-siphoning about 1/2 gallon into the keg, I realized that I have forgotten to place some co2 at the bottom of the keg, so I removed the auto-siphon and pumped co2 into the keg, that's when I heard liquid moving. I then put the auto-siphon back on and heard bubbling from the keg, I am under the impression that this was oxygen. Is the beer ruined? After the keg was filled, I purged it a few times with co2 and then set it in the kegerator for carbonation.
I have also noticed that some trub ran up the auto-siphon, is this going to be a problem? I intended on bottling this batch with a beer gun and passing it out for Christmas gifts.