In the beginning of the episode, when Paige is summoning Grams, she does not say the complete summoning spell. The full spell they use is "hear these words, hear my cry, spirit from the other side. Come to me, I summon thee, cross now the great divide." In this episode Paige says "hear me now, hear my cries, spirit from the other side, cross now the great divide."
When Grams summons the Halliwell matriarchs, she doesn't use the full spell as featured in season 5's "Necromancing the Stone, she leaves off the last two lines. The full spell is:
"I call forth from space and time
Matriarchs of the Halliwell Line
Mothers, Daughters, Sisters, Friends
Our family spirit without end.
To gather now, in this sacred place
and help us bring this child to grace."
When Grams and Victor are in the attic Grams says she's demon proofing the attic and she has a crystal in each hand, she then turns to put down a crystal she extends an empty right hand and both of the crystals are in her left hand.
After the sibling rivalry spell turns the girls into teenagers, Grams and Piper have a discussion where Grams asks Piper if she remembers the first time she was this age having a talk about being a witch. Prue, Piper, and Phoebe didn't find out they were witches until they were in their 20s after grams died, so they couldn't have had that discussion when Piper was a teenager.