Episode #3.6 - S3-E6
Stupidity: The villain concocts a demented plan that puts him at absurd risk (if anything goes wrong, he is caught red-handed) and accomplishes nothing, since it does not make him and his accomplice unlikely suspects any more than anyone in the group. It does not make it look like it was an outsider doing it (no attempt is made to fake a robbery), nor a result of an accident. It makes obvious it was a murder (a knife plunged in the back!) but does not pin the guilt on anyone else in the team, which would have been really easy to do (plant the knife or any of the victim's belongings in anyone's tent) and with the two being in on the scheme without anyone suspecting they were connected to each other, it would have been easy to create an alibi for each other, but they don't have any. It should also be noted that there's no reason why the victim wouldn't have exposed the culprit's crime earlier to his fellow birders, since he knew he was going to harm the animals.
Episode #3.6 - S3-E6
Stupidity: At Catherine's, Humphrey is browsing the photos; neither he or his agents noticed before amongst all the bird and wilderness pics the very obvious series of shots of a woman in a hotel poolside and in close-ups. And yet he has to have printed the (obviously enormous, since he already went through them in the afternoon and investigated the cane seen in them) amount of photos entirely, but finds the photos dining outside from a very small pile on his little dinner table. Those pictures stand out at first glance.
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
raywest ★