The apparel Walt wears when he arrives at the compound is identical to what he wore in the pilot episode, Pilot (2008). He begins and ends the series in the same clothes.
There was one scene cut from the final script for budget and time reasons. It took place after Walt makes the call in which he pretends he's the Times reporter. In it, a former student of Walt recognizes him. Walt pays him off and threatens him to make sure he doesn't rat him out. But before leaving the former student, he asks, "What kind of teacher was I?" The former student replies, "You were good" and then says he remembered the time Walt sprayed different chemicals at a flame and it made different colors.
Vince Gilligan said he couldn't bear to directly watch Walt and Skyler's last scene together because it was so emotional for him.
This episode was watched by 10.28 million people on its premiere night, up from the previous high, episode 5.15 Granite State (2013), which had 6.58 million. This makes Felina (2013) the most watched episode in the series' history.
The shot of Skyler reflected in the microwave was completely accidental. Vince Gilligan admits not knowing he got it until the editor complimented it.