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Spoilers follow for tonight's episode of The Flash, "Welcome To Earth-2."

Update: Watch the portal Easter Egg scene in 4K Ultra HD.

Following last episode where Wells revealed he was helping Zoom steal Barry's powers, Team Flash decides to help Wells by heading to Earth-2 to save his daughter.

Tonight's episode is filled with a bunch of Easter Eggs and references to DC Comics characters.

Here are a few I spotted:

When Barry, Cisco and Wells go through the portal, three teasers are shown with what looks to be a Green Arrow (future version that is appearing in DC's Legends Of Tomorrow? or Connor Hawke?); the CBS Supergirl series starring Melissa Benoist (note: The Flash is crossing over in an episode of Supergirl in March), and the 90s John Wesley Shipp Flash (plays Barry's father in the series). Update: Better pics from the portal are included at the end of the article (and you can watch the scene here).

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The Justice League mural in the CCPD is replaced by a Justice Society reference with "A Free & Just Society":

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Another cool Easter Egg is featured in the home of Iris and Bart Allen (yes, the Earth-2 "Barry" is actually named Bartholomew and they are married). The Earth-2 Barry's mother never died, and the episode saw our Barry call his Earth-2 mother, with the phone having on speed dial: His Dad; his mom and dad (mother get remarried?); Eddie (Thawne?); Bruce (Wayne? - Batman); Hal (Jordan? - Green Lantern); Diana (Prince? - Wonder Woman). The phone conversation also saw a reference to Atlantis (home of Aquaman).

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Other Earth-2 Easter Eggs and references:

Henry Hewitt (Demore Barnes) works for Wells/Star Labs (aka villain Tokomak).

The mayor of Earth-2 Central City is Mayor Leonard Snart (Captain Cold).

Detective West is Iris West.

Floyd Lawton is Iris' partner (Suicide Squad's Deadshot).

Joe West is a singer (and can sing in real life).

Caitlyn is Killer Frost.

Robbie Amell is Deathstorm.

Evil Cisco is known as Reverb and has more powers.

I think they closed the portal location that sent Grodd to Earth-2.

I didn't spot them, but Jonah Hex and a Legion ring are also said to be referenced (update: see below).

Did I miss any?

You can watch the preview for the next episode of The Flash, "Escape From Earth-2," here.

"The Flash" airs on the CW Tuesdays at 8pm ET starring Grant Gustin, Candice Patton, Danielle Panabaker, Carlos Valdes, Tom Cavanagh and Jesse L. Martin.