Some translations set each line of poetry farher to the right than the rest of the text to make it easier to read. The ULB does this with the poetry in 15:8-9, which is quoted from the OT.
The "traditions of the elders," that is, the oral laws, are an important concept in this chapter. These were the rules that the religious leaders among the Jews developed in order to ensure that the Law of Moses was obeyed. However, these rules often became more important in practice than the Law of Moses itself. Jesus rebuked the religious leaders for this, and they became angry as a result. (See: [[rc://en/tw/dict/bible/kt/lawofmoses]])
The Canaanite woman's trust in Jesus contrasted greatly with the Jewish leaders' refusal to accept him. This contrast served as a strong rebuke of those leaders.
#### Other possible translation difficulties in this chapter ####
##### Sheep #####
People are often pictured as sheep in scripture. In this chapter, the image of sheep illustrates that the Jews were spiritually lost without a proper leader to guide them.