When Heather is holding a burning cigarette lighter, preparing to immolate her husband, the lighter appears to go out, then in the next shot of her, it's burning again.
Once again Maura finds trace amounts of substances on a victim's skin that cannot possibly be there. This time, she supposedly found trace amounts of synthetic rubber from the soles of hiking boots. Human skin is not tough enough nor rough enough to scrape hardened rubber, designed to withstand walking and hiking, off the soles of boots.
When Maura's phone rings with a call from her father, she picks it up to decline the call. However, the screen doesn't show an incoming call with an option to pick up or decline. The screen shows mute, keypad, speaker, add call, contacts, an option to video chat, and a red hang up button. These are all icons on the screen when you are already on a call, not when you have an incoming call. There isn't even an icon for her to accept the call.
Having allowed poor Sasha Alexander to walk slap into the embarrassment of mispronouncing Euler as "Yooler" in series 1 ep 6, one might have expected the production team to take care she knows the correct pronunciation of any German mathematicians she might be given in the script. But no, here they let her do it again. This time it's Gauss(ian), rendered as "Gauze"(ian), at around the seven minute mark.