I'm sitting here muttering sounds to myself: *he only... heeyonly.." (wouldn't it be good if we could hear each other!) I think the "intrusive y" is simply a transitional sound that emerges when the mouth moves from ee to oh. (There is probably a proper term for this but I can't remmber what it is.) The only way to avoid it would be to use a slight glottal stop, and this is what some speakers do. The intrusive r is a bit different, as many speakers manage perfectly well without using either the R or the glottal stop in, say, "I saw a .."

The L is another interesting case. Scottish speakers, for instance, make little or no distinction between the light and the dark L, so a word like "little" has two very similar sounds, and "call" has the same L as "calling". What interests me about this is that there was once a corresponding sound-shift in French, so words like "beau" and "belle" were once the same or at least much closer, and "chateau" is related to "castle" (the French dropped the s sound and we dropped the T); and nowadays, a Londoner might well lose the L sound when saying "castle", pronouncing it "cassow"". It makes me wonder whether this sound-shift in south-eastern England in in some way connected to the French one, since they're geographically so close?

Marje