That's active fermentation making natural CO2, a good sign. Just "burp" the lid to release the gas and you're set.
There's fizz, cloudiness, or a little sediment.
All completely normal for raw, unpasteurized ferments. It's the live culture doing its job. Keep it cold, give it a gentle swirl, and dig in.
It arrived at room temperature.
No problem. The natural acidity of a live ferment keeps it safe without refrigeration for the length of a normal shipping trip. Pop it in the fridge on arrival.