[Gravityloss]

or have subtitles in German at first. Also helps if you repeat some catch phrases aloud. Especially fun if you're watching together with someone.

One cool effect is that your vocabulary can be heavily concentrated on what you're watching. Like police procedures. (in Alte they speak very clear German, can recommend.)

[culebron21]

The only case for me, when subtitles helped, was watching British TV series, first without subtitles, then with them, and improving listening. But only after all the grammatical heavy lifting.