Good basic tutorial. Watched it because I was hoping to learn something new, but I guess it's good that I didn't since I've been making tilesets for a while now. I wish it was as easy to create seamless tiles for anti-aliased styles as it is for pixels but the closest thing I've found is using programs that support wrap around canvas edges like Krita and Painter.
FYI, in Photoshop the subdivision lines are different than the grid lines so you can get that look without using the guidelines. Subdivisions are dotted, grid lines are solid. I have mine set up with a grid line every 32 pixels with 4 subdivisions. That gives me dotted lines for the 16 pixels but solid for the 32. It makes it easier for new images that way.
Lets see, tips and tricks. Hmm. Well, if you're making pixel tiles I cannot recommend Pyxel Edit enough. It is a fantastic program, well worth buying, really cheap for what you get. There's a early version that's available for free if you can't buy things on the internet for some reason. It's buggy and can't do nearly as much as the full version but it is still incredibly useful and highly recommended. I'll post here again later if I can think of any more.