Trivia
- Molly has sung the most Pop Songs followed by Gil.
- In the first 2 seasons, her microphone had the same pattern as her tail. In Season 3, however, it was replaced by a yellow one. The reason for this is still unknown.
- In The Crayon Prix! she stated that her favorite color is blue, but according to Nick Jr's Bubble Guppies Collector Cards , it says her favorite color is pink, like Oona.
- Also according to the collector cards, her favorite lunch is a turkey sandwich with a tangerine.
- Molly is the only guppy to have a sibling shown onscreen.
- Molly may have feelings for Gil.
- Molly's best friends are Gil and Deema. However, her real and true best friend is Gil.
- Molly narrated 10 story segements in the episodes Who's Gonna Play The Big Bad Wolf?, Boy Meets Squirrel, Construction Psyched!, Swimtastic Check-Up!, Rockin' Out!, Genie in a Bubble!, Winter Sports Chompetition!, The Big Rig Bandit!, Trouble in Harmony Valley!, and A Slow Day in Zippy City!, except Season 4.
- In The Beach Ball!, Molly was hiding in a clam shell while Gil was singing in the pop song. This would be a reference that in fictional times, mermaids mostly hide in clam shells.
- Molly (along with Gil's name, Gilly) is the only Guppy with a common English name.
- Her name is also a type of fish that is similar to guppy fish.
- In the pop song I Love My Hair!, when there is an image of Molly with her original brown hair, she looks exactly like her voice actress, Brianna Gentilella.
- Her voice in the UK dub is Abriella Bierer who would later voice Katie from PAW Patrol in the same dub.
- Molly (along with Gil and Bubble Puppy) is often used to represent the show on merchandise and other things.
- Molly is the only character to call Gil, "Gilly" and she calls him that a lot.
- Molly is left handed in writing.
- Molly has good leadership skills, like in Happy Holidays, Mr. Grumpfish!, she showed her leadership by telling the other Guppies what to do to create a gingerbread house for Mr. Grumpfish.
- In Season 3, Molly's voice actress, Brianna Gentilella, is one of the very few voice actors left from the original cast.
- In Season 4, in Bubble Baby!, Molly becomes big sister to Mia.
- In the same episode, Molly mentions having parents, but we have yet to see what they look like.
- In season 5, the microphone returns to its original blue color from seasons 1 and 2.
- Molly's favorite ocean animal is a dolphin, as seen in The New Guppy.
- Molly is the only character whose season 1 and 2 voice actress returns to voice her in season 6; in this case, it’s Brianna Gentilella.
- Molly does her first and only lunch joke in Mystery on the Guppy Express!
- She was similar to the female background character, Mackenzie from the TV show, Sunny Day.
- She’s the only character to not have an ending quote during seasons 5 and 6.
- Molly appears in Season 1 and Season 2 of the Noggin series Noggin Knows.