For examples:
Lucy
I'll take a whack at this one.
AL 288-1, "Lucy", Australopithecus afarensis Discovered by Donald Johanson and Tom Gray in 1974 at Hadar in Ethiopia (Johanson and Edey 1981; Johanson and Taieb 1976). Its age is about 3.2 million years. Lucy was an adult female of about 25 years. About 40% of her skeleton was found, and her pelvis, femur (the upper leg bone) and tibia show her to have been bipedal. She was about 107 cm (3'6") tall (small for her species) and about 28 kg (62 lbs) in weight.
In 1987, creationist Tom Willis accused Donald Johanson of fraud, claiming that the skeleton known as "Lucy" consisted of bones that had been found at two sites about 2.5 km (1.5 miles) apart. Willis had actually confused two separate finds which belong to the same species. (This was in spite of the fact that a best-selling book (Johanson and Edey 1981) has photos of both fossils: AL 129-1 is a right knee, while Lucy has a right femur and a left tibia.) This was a spectacular error which could hardly have been made by anyone who had done the most elementary research, but that didn't stop many other creationists from picking up the claim and repeating it. For a full history of this claim, read the talk.origins knee-joint FAQ file (Lippard 1997).
Creationists rarely address the issue of why australopithecines have a foramen magnum at the bottom of the skull. Gish (1985) criticizes Dart's reasoning that the Taung baby walked upright, based on the position of its foramen magnum. Gish correctly states that the position of the foramen magnum is closer in juvenile apes and humans than it is in adults (in apes, it moves backwards during growth), and concludes that Dart was unjustified in analyzing this feature on a juvenile skull. This is the same criticism that Dart originally faced from scientists, but Gish fails to mention that later evidence proved Dart's analysis correct and silenced his critics.
Creationists also rarely mention australopithecine teeth. Gish says that "[Dart] pointed out the many ape-like features of the skull, but believed that some features of the skull, and particularly of the teeth, were man-like". (Note the misleading implication that the apelike features really exist, while the humanlike ones are a figment of Dart's imagination.) Gish disputes this, pointing out that the molar teeth of africanus are extremely large. What Gish does not tell readers is that this is one of the few differences between them and human teeth. When the teeth of the Taung child could be properly examined, Dart's claim was strongly confirmed, and is now generally accepted:
"In fact, though the molars were larger than is now normal, most of the teeth [of the Taung child] could have belonged to a child of today." (Campbell 1988)
Source: http://www.talkorigins.org/faqs/homs/a_piths.html.
See also: Lucy's Knee Joint: A Case Study in Creationists' Willingness to Admit their Errors.
So, it looks like, for Lucy at least, the charge of fabrication is false. That still leaves superstition--but the ball's in your court now.