Originally Posted by Zamial
Those are probably not air bubbles in the line during racking. That would be CO2 that was in suspension in the ale that was "knocked out" during the transfer.
I'm not sure it was CO2. These were large bubbles, almost certainly air. It happened to a couple batches before I realized that I needed hose clamps to get a tight connection around my bottling wand when I first started brewing. I still notice the CO2 bubbles you describe though, but that doesn't worry me. Those two batches were around for quite a while and I didn't notice anything.
Another time I pulled a good deal of air while transferring an IPA to the bottling bucket because of a dry hops clog. That beer actually turned out to be one of the best beers I've made! Of course, I drank it in just a couple months so I can't really say if it effected the taste in the long run. Now I always use a paint strainer bag to prevent this.
Evidently, it does occur though. There's enough people on here who've had problems. I guess I've been lucky the few times I had O2 issues. It would be nice to hear from other people who've had similar experiences to me though, so I know I can actually detect wet cardboard!