Iris also seems to show hints of this subtly, it becomes more obvious at the party.
Brick Joke: Isobel at the beginning says that she "wants to go to the Coffee Bean and talk about things for which there is no solution." Guess what happens after she breaks up with Jack?
Cloudcuckoolander: Nina and Maria believe that Isobel's Aunt Clara (and Isobel herself kinda) to be this. Maria shows shades of this in the film.
Comically Missing the Point: When Isabel was trying to show Jack she is a real witch, he mistakes everything as stage magic, such as making a mustache appear on his yes man's face, then it vanishing, or a tiny umbrella in his drink.
Dance of Romance: Kinda. Partway through the "actual date" between Jack and Isobel, they go back to the studio and spend their time dancing around the set. It ends with a kiss.
Expy: Besides the actors and actress, half the characters outside the show are the expy of someone in the series. For those who don't get it, Isobel=Samantha, Jack=Darrin, Iris=Endora (both on and off the set), Nigel doesn't QUITE fit the mold of Maurice, but is an expy of him otherwise.
Lampshade Hanging: Shortly after the second date between Jack and Isobel, the two characters try and fail to hide their feelings on the set the next day. EVERYONE else on set notices however Jack and Isobel are oblivious to this (Isobel at least until Nina points it out)
Mundane Utility: At first, Isabel tries to avoid using magic at all, later she uses magic to connect her cable and TV set.
Mundane Made Awesome: This is shown in a montage from Isobel's point of view. Such mundane things include turning on the sprinklers in her front yard, popping popcorn in a microwave, dimming the lights and opening cans of soft drink.
Refuge in Audacity: Isobel whenever she's "filming" shortly after she cottons on to the fact that she's The Voiceless. Iris calls her out on it briefly, but otherwise the little pranks and whatnot are passed off as random occurrences or SFX failure. Mainly used to help keep up the masquerade.
She also briefly pulls this when she's meeting Jack's ex-wife.
ReBoot: In-universe, the show Bewitched goes through this.
Reset Button: Pulled partway through the film when Isobel realises that her love spell is getting out of control and rewinds it back to when Jack is on "Inside The Actors Studio." She does it again later when she drops a lighting fixture on Jack's ex-wife and realises that she may have taken it a bit too far.
Small Name, Big Ego: Not so much the "small name" part, but Jack's ego is huge (evidenced in-universe by his own giant cappuccino machine to himself and 2 giant trailers, plus his diva attitude at the beginning of the film). It's not helped by Ritchie one bit however and it's implied that Ritchie himself encourages this.