Wrong style in help screenshots
The "Watching a DVD or VCD" help page (file help/C/playing-DVD.page, line 23) has two screenshots that seem to not following properly the style guides:
The above image shows a notification of GNOME, but using Adwaita-dark theme and a non-default wallpaper, which seems to be against the "Screenshots for documentation" page at GNOME Documentation Project wiki page
The above image shows GNOME Files with a drop-shadow effect on the image, which seems to be incorrect according to the GNOME Documentation Style v1.6