It's never a good idea to pull a quilting all-nighter. Morning light will come & reveal a multitude of mistakes.
When measuring with a ruler, make sure the lines on the ruler are thin because if they are too thick, every cut will be off by 1/16" and that adds up across the width of a quilt.
Yellow Ultra Clean markers are the hardest to get out of fabric. I use all the other colors. (Also, one of my earliest mistakes: when you are a beginning quilter, do not mark your quilting lines with the air-erase purple marker because they will disappear before you get the entire project quilted.)
If your quilt is marked with FriXion pen & it gets ironed (not saying by whom), you can bring back the marks by placing the fabric in the freezer for 10 minutes.
Color Catchers can solve most any problem that involves ink or dye running in the wash. Don't overload the dryer or dry on medium/high as those promote crocking.
Dryer sheets are very bad for quilts, but very good for cleaning fusible webbing off of irons.
And, the most expensive mistake I learned: do NOT iron completed embroidery with an iron on high heat. It will melt the (rayon) embroidery thread & destroy your iron... and then, unless you own an embroidery machine, you will be paying someone to re-do all that beautiful embroidery work.