Season 1 & OVA 1
Season 1's Episode cards display a "cut number", the episode number inside a circle, and the title.
The "cut number" is what frame in the episode that end card appeared. Every time a camera changes perspective, or "cuts", it counts as a new frame. This is only applied to background cuts. Panning, character animation, OP's, and ED's do not count towards a storyboard/episode's cut numbers.
Season 2 & OVA 2 (Zoku)
The season 2 end cards were shown during the original broadcast run on TBS in 2015. They were also included in the digital menus of the Japanese release special edition DVD/BluRay sets.The end cards depict the journey of a can of Max Coffee that gets traded from character to character. It eventually ends up with Yukino who gives it back to Hachiman. This parallels the main story where Hachiman does not drink Max Coffee in Season 2 until Yukino brings him one (Season 2 Episode 11).