Young Sheldon looks stoic as he holds up a labeled videotape.

Sheldon Cooper started college early, in part thanks to this video presentation.

Photo: Michael Yarish/CBS

Easter eggs aren't just for Easter.

Half the fun of watching Young Sheldon is spotting nods to the mothership, The Big Bang Theory. Eagle-eyed fans: How many of these references do you remember?

Watch Young Sheldon Thursdays at 8 p.m. ET/PT on CBS. Stream anytime on Paramount+.

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Professor Proton

A close up look at two hands weilding tape in front of a torn publicity photo of Professor Proton

Sheldon idolizes Professor Proton.

Phot credit: CBS

S4 Episode: “The Wild and Woolly World of Nonlinear Dynamics”

During an argument, Missy (Raegan Revord) rips Sheldon’s (Iain Armitage) autographed Arthur Jeffries poster in half. Bob Newhart’s alter ego, the host of a kids’ science show, is Sheldon’s childhood idol—and will make several appearances in TBBT.

Chalk-Worthy

Young Sheldon sits in the principals office in front of a black board arguing

Sheldon was always ahead of the class.

Photo credit: Bill Inoshita/CBS

S3 Episode: “A Secret Letter and a Lowly Disc of Processed Meat”

Sheldon’s presentation on why he should go to college looks an awful lot like his future “Fun with Flags” video series.

Wait, Was That …?

Young Sheldon rests in bed under the covers with a thermometer sticking out of his mouth

A sick Sheldon

Photo credit: Robert Voets / 2019 Warner Bros. Entertainment Inc.

S3 Episode: “Teenager Soup and a Little Ball of Fib”

Some TBBT cameos are more heard than seen. When Sheldon dreads taking a swim test in gym, he’s taunted by a bacteria-infested pool during a nightmare—voiced by Kaley Cuoco.

A Catchphrase Is Born

Young Sheldon holds up a fake can of mixed nuts as he tries to convince someone that there is no snake inside

Bazinga!

Photo credit: Darren Michaels/Warner Bros. Entertainment Inc.

S2 Episode: “A Stunted Childhood and a Can of Fancy Mixed Nuts”

The boy genius visits a novelty shop and learns about a line of prank products. The tagline? “If it’s funny, it’s a Bazinga!”

The Brainiac’s a Trainiac

Young Sheldon stands among an array of model trains smiling with glee

Sheldon has always loved his trains.

Photo credit Sonja Flemming/CBS

S1 Episode: “Pilot”

Close-up on young Sheldon’s model locomotive set. “I’ve always loved trains,” says adult Sheldon, voiced by TBBT star Jim Parsons. “In fact, if my career in theoretical physics hadn’t worked out, my backup plan was to become a professional ticket taker. Or a hobo.”

“Soft Kitty”

Young Sheldons mother sits on a couch cradling a surgically masked Sheldon under an afghan blanket

Sheldon and his mother, Mary

Photo credit: Darren Michaels/Warner Bros. Entertainment Inc

S1 Episode: “A Sneeze, Detention, and Sissy Spacek”

The germaphobe’s go-to “get well” lullaby was first sung by his mother, Mary (Zoe Perry), after Sheldon contracted a cold.

The First Relationship Agreement

Young Sheldons Meemaw sits at a kitchen table talking to Dr. Sturgis over a bowl of ice cream

Relationship agreements are an integral part of budding romance.

Photo credit: Erik Voake/CBS

S1 Episode: “Vanilla Ice Cream, Gentleman Callers, and a Dinette Set”

Long before Sheldon drafted a 31-page contract after he and Amy became a thing, 10-year-old Sheldon drew up the Cooper-Sturgis-Tucker Behavior Agreement, which set ground rules for Meemaw’s (Annie Potts) relationship with his mentor, Dr. John Sturgis (Wallace Shawn).

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Watch Young Sheldon Thursdays at 8 p.m. ET/PT on CBS. Stream anytime on Paramount+.

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