Stranger Things

Holly Wheeler's moments on-screen were unscripted. When she slouches at the dinner table and in another scene replies, "Yes!" were ad-libbed.

The character of Holly Wheeler (Mike's baby sister) is played by identical twin sisters.

The bicycles the boys ride were retro fitted with parts to appear correct for the time in 1983. Small front chainrings and geometry for those bikes weren't around for at least another 10 years.