The Day Betelgeuse Laughed (平家星の笑った日) is the forty-third episode of the overall series and the eighteenth episode of Season 2 of the Re:Zero anime.
- Lots of minor details were omitted, such as Regulus stating his reasoning for being in the forest was to make Fortuna his 79th wife.
- Regulus explaining how Petelgeuse was the co-founder and leader of the moderate faction of the Witch Cult, was omitted.
- Regulus throwing gravel at Fortuna and almost decimating her, was omitted.
- Petelgeuse getting his legs clawed off by Regulus' Authority of Greed was omitted.
- A scene where Arch and Emilia encounter one of Petelgeuse's fingers who explains the situation to them seconds before getting attacked by the Kurohebi, was omitted.
- Subsequently, information that Regulus is in fact the leader of the Radical Faction of the Witch Cult, was not given.