67. Deliberately giving Salaam after two rak'ahs in a prayer that is not actually a two-rak'ah prayer because the person mistakenly thinks he is a traveler, or thinks the prayer is Jumu'ah, or thinks he is in Tarawih when he is actually performing Isha.
68. A person newly acquainted with Islam mistakenly believes that the Fard prayer is only two rak'ahs and deliberately ends it after two.
The source treats these as deliberate terminating Salaams before the prayer's proper end, even though the mistaken belief explains why the person did it.