S1.18 - "The Piximon Cometh" - from "The Iceman Cometh," a play by Eugene O'Neill.
S1.25 - "Princess Karaoke" - from another Anime "Princess Mononoke"
S1.48 - "My Sister's Keeper" - reference to the Biblical Cain and Abel. When Cain kills Able
God asks him where Able is and Cain answers "Am I my brother's keeper?"
S1.53 - "Now Apocalymon" - likely a reference to the film "Apocalypse Now."

S2.04 - "Iron Vegiemon" - from the TV show, "Iron Chef," further substantiated by the numerous cooking metaphors RedVegiemon uses in the episode.
S2.09 - "The Emperor's New Home" - from the fairy tale, "The Emperor's New Clothes."
S2.12 - "The Good, the Bad and the Digi" - From the Film Name "The Good, the Bad and the Ugly,"
S2.13 - "His Masters' Voice" - from a painting of the same name
S2.15 - "Big Trouble in Little Edo" - "Big Trouble in Little China" .
S2.16 - "20,000 Digi-Leagues Under the Sea" - "20,000 Leagues Under the Sea by Jules Verne."
S2.18 - "Run Yolei Run" - "Run Lola Run."
S2.20 - "The Darkness Before Dawn" - from the saying "It's always darkest before the dawn."
S2.22 - "Davis Cries Wolfmon" - "The Boy Who Cried Wolf."
S2.24 - "If I had a Tail Hammer..." - From a song "If I had a Hammer,"
S2.26 - "United We Stand" - working out of the saying, "United they stand, divided they fall."
S2.32 - "If I Only had a Heart" - "The Wizard of Oz song."
S2.36 - "Stone Soup" - from the fairy tale of the same name.
S2.37 - "Kyoto Dragon" - from "Komodo Dragon,"
S2.49 - "The Last Temptation of the DigiDestined" - title of a Biblical movie, "The Last Temptation of Christ."

S3.02 - "Digimon, Digimon Everywhere" - from the proverb, "Water, water everywhere, but not a drop to drink."
S3.03 - "To Fight or Not to Fight?" - from William Shakespeare's Hamlet "To be or not to be?"
S3.04 - "It Came From the Other Side" - From a film "It Came From Outer Space."
S3.05 - "Dream a Little Dream" - From a song with the same name or from the Cardcaptors Epi with the same name
S3.06 - "O Partner, Where Art Thou?" - Could be from Romeo and Juliet with the famous balcony sceen but mixed up
S3.10 - "The Icemon Cometh" - Same as The Iceman Cometh
S3.11 - "Much Ado About Musyamon" - "Shakespeare's "Much Ado About Nothing."
S3.12 - "Divided They Stand" - "United they stand, divided they fall."
S3.15 - "Snakes, Trains and Digimon" - From another Movie: "Planes, Trains and Automobiles,"
S3.19 - "Impmon's Last Stand" - Based on Custers Last stand at Little Big Horn
S3.22 - "The Boar Wars" - Star Wars.
S3.25 - "Brave New Digital World" - based on the novel, Brave New World,
S3.26 - "Kazu and Kenta's Excellent Adventure" - play on the title "Bill and Ted's Excellent Adventure,"
S3.28 - "Blame it on Ryo"- another movie, "Blame it on Rio,"
S3.30 - "The Imperfect Storm" - Based on the Fikm "The Perfect Storm,"
S3.35 - "Give a Little Bit" - could be based on the Supertramp song of the same name (ask your parents if ur too young to remember!).
S3.37 - "No Mon is an Island" - play on the famous quote by John Dunne, "No man is an island, complete unto himself."
S3.38 - "Azulongmon Explains it All" - based on "Clarissa Explains it All (ironic that CEIA was on Nickolodian!)
S3.40 - "Janyu's Ark" - Biblical story of Noah's Ark.
S3.46 - "When is a Mon Justimon?" - based on the Biblical query, "When is a man justified?"
S3.47 - "His Kingdom for a Horse" - Shakespeare's "Richard III," "A horse! A horse! My kindgom for a horse!"
S3.51 - "Such Sweet Sorrow" - one more Shakespeare "Romeo and Juliet." "Parting is such sweet sorrow,"

S4.6 - "Molehill out of a Mountain" - rearrange it to Mountain out of a Molehill a saying when things have been exagerated
S4.7 - "Island of the Misfit Boys" - A flim Island of the Lost Boys
S4.9 - "Welcome to my Nightmare" - Taken from Nightmare on Elm Street
S4.10 - "Can't Keep a Grumblemon Down" - Can't keep a good man down
S4 13 - "Hunka Hunka Burning Greymon" -From a song Hunka Hunka Burning Love
S4.14 - "No Whamon" - A saying No way man
S4.15 - "Beastie Girl" - The group Beastie Boys
S4.16 - "The Swiss Family Digimon" - The Swiss Family Robinson
S4.18 - "Trailmon v Trailmon" - Film Krammer v Krammer
S4.21 - "Darkest Before Duskmon" - same as the S2.20 epi meaining
S4.23 - "Sockit Takuya" - from Sock it to ya.
S4.27 - "Stuck in Sakkakumon With You" - from the song stuck in the middle with you.

Digimon Movie 4: "Diaboromon Strikes Back"- The Empire Strikes Back - Star Wars!