The first lesson I've learned is don't work when you are tired. I'm laying 3/4" prefinished hickory in 3, 4, and 5" widths. I just finished up laying a 3" row and noticed that one of the last boards just doesn't look correct. The tongue is even with the boards on each side but the groove side has a large gap. The question is how do I remove the last couple boards? I'd like to save the boards. Can I use an oscillating tool to cut the nails?

Thanks, Dan

An oscillating saw with a high speed steel metal blade, not high carbon steel, will be good to cut several nails.
To slip under the edge you will want to use a pry bar with a very tapered edge. Most pry bars you will need to sharpen the end so the bade will slide under.
Tap with a hammer to give room to expose the fastener

As a teacher I always told my students when they make a mistake own up to it and learn from it. What I have learned:

Never work when you are tired.
Don't rush.
This morning my grandson asked how the floor was going. I said it was going fine until I got to this point. I pointed down to the big gap. He said why don't you tap it back into place. I said it can't be moved because it's nailed down, then I thought I might just as well try. One easy tap with the block and it popped right into place. I got down to look and what I thought were nails were just the indentations from the striker. Boy do I feel stupid. Lesson learned.