This Miraculous Blooper contains details back from Season 1 episodes 25-26  The Origins.  Also, some of it is fanmade as well.

       Plagg and Adrien stood near the photo of his mother. This was shortly after his father walks off.   Adrien wonders why his father acts so strange and why he stands so close by this picture often.

     "Plagg let me know what you see."  

      "Sure, thing kid."  Plagg replies.

     Plagg moves the picture to reveal a safe behind it.

     Adrien shows his surprise at once with the stunned expression across his face.

     Plagg flies through the hole above the door of the safe. Once inside he opens it from the inside.  This reveals a book about Tibet, a peacock-shaped fan, a photo of his mother, a map of Tibet, an old-looking book (later find out is a book about the Miraculous holders/heroes), and a brooch.   The brooch is no ordinary jewelry, no it is the peacock Miraculous.

      Later, Plagg finds out from Master Fu that he lost the peacock Miraculous years ago along with the moth one. He does not say a word about seeing it in the Agreste household behind the photo of Mrs. Emilie Agreste.

     Fandom:" Come on Plagg, why did not you speak up?"

     Fandom:  "Why did you grab the peacock brooch when you had the chance and return it to Master Fu?   Well, plagg what do have to say for yourself?"

     Plagg: "You can not honestly blame that on me!"

    Fandom: "Fine no Camembert for two whole months!   You will have to eat cheddar!"

   Plagg:  "No, not my Camembert!"

     Season 4:  Ladybug has the chance to grab either the coffee mug with a lid on it that Shadowmoth holds in his hand in the episode Rocktear or the moth and peacock Miraculous Shadowmoth wears.

           Ladybug:  Grabs the coffee mug.  She leaves both Miraculous with Shadowmoth.

          Fandom: Sees this and gaps. Thinks, come on, girl that was your chance and you blew it!  Why the coffee mug and not the Miraculous?  Hmm?

        Shadowmoth: "Ladybug, never makes mistakes!"

        Nathalie:  "Do not worry, sir, Someday she will.  Everyone does eventually."

        Fandom:  Thinks, someday nothing, she already messed up. She should have taken the Miraculous and not just the coffee mug.  

       Facepalms.  

     Fandom:  Also, thinks why does Ladybug trust Alya to keep the fox miraculous permanently as Rena Rogue, even it means she has to disguise herself to remain safe from Shadowmoth?  I mean, it does not seem fair to Chat Noir who has been her partner all this time.

       Flashback...Episode Gang of Secrets! Marinette tells Alya the truth that she is Ladybug. She claims it because she is tired of keeping secrets and tired of all the lies.  She trusts her best friend over her original partner Chat Noir?  Why?

      Pro's: Alya is happy and does not tell anyone.

     Con's: What happens if the pressure becomes too much for Alya?  How will she be expected to keep your secret then?

      Con's: Rena Rogue and Carapace know each other's identities as mentioned to Adrien Agreste by Nino in Rocktear.  Chat Noir and Ladybug do not know each other's identities.  Chat thinks this means Ladybug does not trust him as much as she says. He starts to doubt her and himself.

    Fandom: "Ladybug just tell Chat Noir the truth about Chat Blanc!  Trust him with your secret and you with his."

    Ladybug:" I can not tell Chat!"

     Fandom:  "Why not?  You told Alya Cesaire already.  Besides, you are the guardian of the Miraculous, and Master Fu the previous guardian knew all the holder's identities before he gave that job to you, lost his memories as a hero, and got to marry his sweetheart Marianne."

    Season 4 Episode 18   Wishmaker Spoilers

    Jagged Crocodile:  "Hi, son!"

     Luka:  "Dad, is that you?"

    Jagged Crocodile:  "Help me, I can't swim!"

     Luka rescues him. "Everyone knows that crocodiles can swim!"

     Jagged Crocodile:  "I know, but as a kid, I could not swim."

    *Author's note: Not making fun of people for not being able to swim. 

    Just thought it is ironic Luka ends up having to rescue Jagged when he gets his childhood wish to be a Crocodile.   
 

      Ladybug: "No one knows, right? Not even you?"

      Luka:  "Right, not even me."  He lies here to protect her and Chat Noir.

          Fandom:  "Ladybug, you know that is not right.  Alya knows your secret. Sure she might not know Chat's but she knows yours."  

           Ladybug: "Good thing, Chat Noir and I did not get hit."

          Fandom: "Oh, but you did both you and Chat did get hit by Wishmaker's staff.  You just do not remember because of Luka's second chances and the ladybugs fixed everything back to normal.  So, Shadowmoth found out, but forget again towards the end of the episode."

         Summer Cheng:  "What a relief, Shadowmoth forgot their identities!"

         Summer Cheng:  "Awe, Adrien is starting to like Marinette even more." 

         Plagg:  He puts a speaker next to a round of Camembert. He claims, "I want to hear the melodies of the Camembert strings."  

      Fandom:  "Lol, Plagg!  Cheese does not have strings or a tune!  It is just food, silly Plagg!"         

      *Any suggestions for a Miraculous Blooper from the show, or it can be fanmade, or a blend of both as most here?

   until later, bye-bye little owlets!

   -Summer out!