Helen Slater appears as Lara, Kara's aunt (Kal-El/Clark Kent's mother). She played Kara in Supergirl (1984). Slater also appears in the DC series Supergirl as Eliza Danvers, Kara's mother.
At the start, Kara mentioned that it takes 3 years to travel from Krypton to Earth, which roughly matches the description in Superman Returns, in which Superman is absent for five years due to a trip to and from Krypton.
Lara mentions Jor-El came to Earth years ago; this was seen in Relic.
Unlike Clark's Kryptonian ship (which was designed to hold him as an infant), Kara's ship was big enough to hold her entire family. It is basically the same size as Milton Fine/Braniac's ship from season 5, which also carried both Nam-Ek and Aethyr to earth in season four's Commencement.