Continuity mistake: When Lenny calls Homer about free doughnuts Hans Moleman is in the background (in Lenny's scene) then Homer drives to the lake to dump the pig crap silo and he runs over Hans Moleman, but he was at the doughnut shop so he couldn't have gotten to the lake in time. (00:22:30)
Continuity mistake: When Marge and Homer are in the backyard with the silo, there is a drawing of a pig on it, but in Homer's close-up with part of the silo in the background, the part of the silo that's visible should have the pig drawing at the top, but it does not. Later, when the silo's found in the lake, the words and drawing differ and are much lower on the silo. (00:22:30)
Continuity mistake: When Homer drives to the lake to dump the pig crap silo, there are hundreds of 'No Dumping' signs along the way, but on the way back, all the signs are gone, including the ones Homer missed. (00:22:55 - 00:23:40)
Continuity mistake: When Homer dumps the silo in the lake, there are the words "Pig Crap" on the front and there is no writing on the back. However, when Lou and Eddie find the silo later in the movie, the "Pig Crap" words are there, but the words saying "Return To Homer Simpson, No Reward" has appeared out of nowhere. (00:23:00 - 00:30:50)
Continuity mistake: When Homer cuts the ropes securing the Pig Crap Silo to the car, he leaves an axe mark on his car. In the next shot the mark is gone. (00:23:05)
Continuity mistake: When the silo has been dumped and the pollutant begins spreading, there is no rope on the ground behind the car, but when Homer gets back into the car to drive away, there is a bunch of rope lying on the ground behind the car. (00:23:05)
Continuity mistake: When Homer dumps the silo, in the overhead shot as it sinks, the car is parked right at the shoreline, then as the pollutant spreads in the water the car is much farther up on shore. (00:23:05)
Continuity mistake: We see the interior of Homer's car twice, first when Homer is at the Hazardous Waste Treatment Center, and then again when he and Marge are trying to escape the angry mob. The dashboard and steering column are entirely different both times. (00:23:20 - 00:35:20)
Continuity mistake: When Homer heads to the lake to dump the silo, the car's rearview mirror disappears and reappears. (00:23:50)
Other mistake: When Homer drives through the barrier the second time (leaving the lake after dumping the silo) pay very close attention, his car smashes one portion of the barrier, but his car passes through a second portion of the barrier without breaking it. (00:23:50)
Continuity mistake: The one eye by the back leg of the squirrel keeps disappearing and reappearing depending on the shot. (00:24:25)
Continuity mistake: When Bart and Ned find the mutated squirrel, two EPA workers find the creature. When the female worker says "Environmental Protection Agency" after Ned asks who they are, the squirrel is standing on a rock with nothing under it. In the next shot, there is suddenly something under it for the EPA worker to contain it with. (00:24:30)
Continuity mistake: After Russ Cargill goes through the eye security system, in the overhead shot as he enters the Oval Office, we see the Seal of the President (on the rug) centered between the two couches, and there are two red chairs behind each of the couches. However, when Cargill holds up the tank with the mutated squirrel, the large round Seal is off to the side of the couches and one of the chairs is gone from behind the couch. (00:24:50)
Continuity mistake: When Russ Cargill holds up the tank with the mutated squirrel to the eye security system on the wall, there is a square piece under the handle to secure it to the top. However, when Cargill holds the tank up to the President that square has vanished and it's just the handle. Then when the President is face-to-face with it, a bar has appeared between the two sides of the handle. (00:24:50)
Continuity mistake: When the dome is placed over Springfield, you can see Lenny and Carl in the middle of Springfield. When the dome goes over Moe's and the Church, Lenny and Carl are also at Moe's. (00:25:55)
Continuity mistake: When Russ Cargill provides the President with the first set of five options and spreads them across the desk, the handle on the mutated squirrel tank is perpendicular to the president, but in the next shot the handle has flipped around and is now parallel to the president. (00:26:10)
Continuity mistake: Russ Cargill puts the 5 options on the desk the first time and spreads them out. His hand is then covering the number 5. Camera changes to another angle and his hand is no longer covering the number 5. (00:26:10)
Continuity mistake: After Russ Cargill places the tank with the mutated squirrel on the President's desk, when Cargill says, "Here's our chance to kick some ass for mother earth," the tank's not on the desk where it was placed, but then it reappears where it should be. (00:26:10)
Continuity mistake: When the dome is being lowered over Springfield, The amount of choppers carrying the dome changes depending on the shot. (00:26:20)
Continuity mistake: When the dome is lowered it is done so by 100s of helicopters that release the dome as Homer runs outside. The camera zooms out to show the whole dome and the helicopters have disappeared instantly. (00:26:20)
Answer: Homer has been known not to make the smartest decisions, and the decisions he does make, he makes without fully thinking them through. Clearly he wanted to get some donuts as quickly as possible without thinking of any other ways, so he decided to ditch the silo in the lake as it would be the fastest way of getting it off his back, even if it's not the smartest. Also, putting that aside, he likely wanted his own pick of the donuts rather than have Lenny guess what he wanted.
Casual Person