Original Raw and Uncut
Two-Headed Starfish
Most shows are significantly different early in their run so I'll give examples
1st season of SpongeBob: cel animation, calmer tone and theme, characters voices sounding different due to different recording equipment, no more needs to be said
Season 1-3 of Family Guy: these seasons had more fluent animation, little to no cutaway gags, characters have different personalities, the plots are more cliche, and so on.
Season 1 of Johnny Test: It was the only season to be traditionally animated, it had unique background music, no whip sound, characters were somewhat likeable, and it had a Saturday-morning cartoon feel
Early episodes of Adventure Time: the older animation was filled with thick outlines, noodle-like character designs, Jake was a perfect oval, nowadays he shapes like a gumdrop, the colors were brighter (Watch a season 1 episode and see how bright and colorful it is, and then watch season 6 to see the muted and dim colors), the background music was peppy and intense instead of eerie and relaxed like in later seasons, Finn was more energetic and happy now he's sad and serious. Episode plots were simple and had no plotholes and so on.
Season 1 of gumball: the animation was wonky, flat and stiff, and filled with cool colors, characters had different personalities, the humor was random and goofy instead of the post-Season 1 4th wall jokes and the scenes where characters whisper random facts for no reason that we have nowadays.
1st season of SpongeBob: cel animation, calmer tone and theme, characters voices sounding different due to different recording equipment, no more needs to be said
Season 1-3 of Family Guy: these seasons had more fluent animation, little to no cutaway gags, characters have different personalities, the plots are more cliche, and so on.
Season 1 of Johnny Test: It was the only season to be traditionally animated, it had unique background music, no whip sound, characters were somewhat likeable, and it had a Saturday-morning cartoon feel
Early episodes of Adventure Time: the older animation was filled with thick outlines, noodle-like character designs, Jake was a perfect oval, nowadays he shapes like a gumdrop, the colors were brighter (Watch a season 1 episode and see how bright and colorful it is, and then watch season 6 to see the muted and dim colors), the background music was peppy and intense instead of eerie and relaxed like in later seasons, Finn was more energetic and happy now he's sad and serious. Episode plots were simple and had no plotholes and so on.
Season 1 of gumball: the animation was wonky, flat and stiff, and filled with cool colors, characters had different personalities, the humor was random and goofy instead of the post-Season 1 4th wall jokes and the scenes where characters whisper random facts for no reason that we have nowadays.