What ate some tips to be able to get a pound cake out of a bunt pan without it sticking inside the pan?

I find in addition to the good tips provided here, it also matter what kind of Bundt pan I use. My oldest one, a heavy pan, sticks every time, no matter what I do. And my daughter has a thin, cheaper one that is much newer but also does not want to release the cake. (These were both reputed to be non-stick.) I bought a new one for each of us -- the Nordic Ware Platinum Collection Anniversary Bundt Pan -- that works beautifully.

Use the spray oil specially made for baking (like PAM). It has oil and flour. If you only have regular spray oil, spray the pan well, dust it heavily with flour, then invert the pan and tap the excess out. Always works for my Bundt cakes.

I slather the butter in every nook and cranny, and then I sugar the pan. It slides right out when I turn it over.

In my experience as long as I really take the time to thoroughly butter absolutely every last nook and cranny of the inside of the pan, all the way to the outer edges, the cake will come out relatively easily. It's a little tedious, but well worth it for a beautiful cake!